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The K-Force Files (Part 3)

I covered what the K-Force files are, and why I wrote them in Part 1, which covered Terminology, Locations, and Organizations in a kaiju-rich world. Part 2 presented some of the most important Kaiju within the setting.

Here in Part 3, I go over some of the hardware used, mostly by K-Force, to handle Kaiju threats.


Gunslinger Gamma: Gunslinger Gamma is an enormous 300-foot tall mecha operated by K-Force. Sometimes referred to as a kaiju itself by the public, Gunslinger Gamma requires a 2-personc crew to operate and thus is categorized as a vehicle by K-Force.

As K-Force studied the properties of Kaiju and their K-Calls ability to alter how fundamental forces operated in a field around a kaiju, and acquired partial blueprints on the technologies used to create Mecha-Deltara, an experimental build program was initiated to attempt to emulate this effect using massive quantum generators. Because the generators were trying to match quantum field readings from specific kaiju, the vehicles housing them had to conform to roughly the shape of the kaiju from which those readings were taken.

In 2013, the program produced 6 K-Class Mecha, which were deployed in a rush to face kaiju threats including Tarankura’s attack on New York City. The Mecha faced 6 J-Class and K-Class threats in 6 months, and all but Gunslinger Gamma were destroyed in the process. In 2014, Gunslinger Gamma took on, and defeated, the Tier Kaiju Void God KLKQ, making it the only purely Earth-built device to ever defeat a tier 1 K-class threat in solo battle.

So far, all efforts to create a second Quantum Generator that can duplicate the field used by Gunslinger Gamma have failed, leaving it the only active and proven antikaiju mecha.

KDestroyers: K-Destroyers (or Kaiju Destroyers, or K-Ds), are K-Force ground vehicles designed specifically for dealing with J-Class and K-Class threats. While they are clearly derived from modern tanks and AFVs, K-Ds are purpose designed to engage giant monster threats. As a result they generally focus on overwhelming firepower and mobility. Because a direct attack from a K-class threat can destroy even the most heavily armored standard-technology military vehicle, K-Ds normally have just enough protection to prevent ricochets and rubble from taking them out. They also aren’t designed to oppose enemy infantry with antitank weapons.

Gen 1 K-Ds were essentially tank destroyers with some armor removed in favor of higher speeds. Gen 2 and 3 K-Ds were increasingly specialized vehicles, and the few designs of Gen 4 K-Ds often look nothing like modern AFVs.

(Art by Avasylenko)

M-Destroyers: M-Destroyers (or Maser-Armed Destroyers, or Mas-Ds) are Gen 4 K-D chassis equipped with powerful masers (Microwave Amplification by Stimulation Emission of Radiation, also sometimes called ‘Microwave Lasers). Masers are the most effective anti-Kaiju weapon using standard technology available to Earth. Mas-Ds are bigger, slower, and less armored than K-Destroyers, and are deployed as far away from K-Class threats as possible while remaining in effective maser range.

Mobile Armor Pods: MAPs are much smaller mecha, averaging 8-12 feet in height, used by K-Force primarily to allow spotters, observers, scouts, and researchers to get close to rampaging kaiju while remaining protected from debris and wreckage. They can be armed if a situation warrants it (such as if a swarm of juvenile Taranturas are overrunning an area), but normally primarily carry lifter arms, communications gear, scanning equipment, and scientific instruments.

Striker Ks: The Striker K airships are electromagnetic hover ships, and form K-Forces’ primary antikaiju fleet. They are designed as operate as small sea vessels do, but with the significant advantage of being airborne. They are roughly the size and power of modern navy destroyers and are often used as testbeds and delivery platforms for specific antikaiju devices.

Submersible X: K-Forces mobile field headquarters, Submersible X is an extremely advanced submarine aircraft carrier and missile carrier. It can operate at extreme depths underwater, and is able to transport Gunslinger Gamma. It carries the very first successful Quantum Generator K-Force ever possessed, though unlike those used in Gunslinger Gamma, Submarine X’s generator is repaired Externian technology salvaged from the ruins of Lemuria.

Submersible X has faced kaiju directly, and even defeated Gangcheora on multiple occasions.

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The K-Force Files (Part 2)

I covered what the K-Force files are, and why I wrote them in Part 1, which covered Terminology, Locations, and Organizations in a kaiju-rich world.

Here in Part 2, I go over some of the best-known kaiju in the world. This is far from a complete list of all kaiju who have ever appeared, just the best-known kaiju, along with a representative sample of lesser giant monsters.


Annihilah: A tier 1 kaiju, Annihilah appeared in 1995 and immediately sought out Tsarkyrkon. A crustacean-like kaiju, Annihilah was immune to Tsarkyrkon’s nuclear fire breath, and could stun the God of Kaiju with a Neuron Burn Beam. It fact, Annihilah was created by sea life that had been mutated by the Neuron Suppressor (used to drive off Tsarkyrkon on his first appearance) and exposed to Tsarkyrkon’s k-cell-infused blood. The mutated creatures had slowly sought each other out and merged, until at some point they gained sentience, and sought to finish the task of killing the god of kaiju, which was to be the first step in destroying all life. Annihilah was destroyed by Tsarkyrkon, with K-Force’s aid in weakening the hybrid Neural-Suppressor-created kaiju.

Arcotopeltus: A Tier 2 kaiju, Arcotopeltus is a heavily-armored quadrupedal reptilian kaiju that can create subsonic fields which damage anything that touches it, and can turn ground and earth to quicksand allowing it to swim through the ground as if it was water. Arcotopeltus was the first kaiju to fight Tsarkyrkon, in 1955 and, upon being defeated, has only operated to support the God of Kaiju.

Deltara: A heavily armored burrowing quadrupedal kaiju, Deltara made a series of appearances in 1965, when it arrived to oppose XJPT (usually pronounced CHI-jar-pit), one of the three the so-called Void Gods which it is generally accepted to have been sent to Earth by an as-yet unknown alien intelligence (which were the Externians), likely with hostile intent. Deltara burst from the ground before XJPT reached Tokyo (the most populated city in the world at the time). Using an as-yet-not-understood “force beam” which allowed Deltara to both swim through bedrock as if it was liquid and slice through nearly any material at range, Deltara drove off XJPT, though not without suffering extensive wounds. (The other two Void Gods were driven off, but not destroyed, by Tsarkyrkon and Vespira).

The two would clash five more times, at the edge of five major cities worldwide. At each battle, prepubescent children are reported to have felt strong compunction to approach the site, and anecdotal reports claim Deltara grew stronger as more children watched it fight. However, children within a mile or so of such battles began to show signs of psychic abilities, which have since been attributed to their exposure to the k-cells in both Deltara and XJPT. Even today, the majority of confirmed psychics are, or can trace their lineage back to, adolescent witnesses of the 1965 Deltara/XJPT conflicts.

The final battle between the two took place outside Mumbai. Forewarned by children chanting Deltara’s name for hours, most parents fled the city to ensure their children would be nowhere near such a conflict. Deltara destroyed XJPT (though the Void God may have since been reincarnated), but died in the process. Deltara was never studied while living, and his remains were claimed by the General Oil Company. Because of his behavior during the Void Gods crisis, and cave paintings that bare some resemblance to him, many kaijologists believe Deltara was a Guardian Spirit, and possibly an extremely old one.

Gangcheora: Gangcheora is a wingless, flying serpentlike kaiju that can control storms and tides, and breathe a ray that advanced the age of whatever it hits. Apparently once a Guardian Spirit of a civilization destroyed 10,000 years ago by the Externians dwelling in the ruins of Atlantis, it awoke in 1964, and immediately began attacking any signs of advanced technology. The K-Force vehicle Submarine X was rushed into service to seek and defeat Gangcheora, and wounded it badly enough the kaiju was thought dead as it fell into the Mariana Trench. However, Gangcheora survived, and has fought K-Force several times since then.

Ghengis Kong: Ghengis Kong is an oddity amongst kaiju. The massive primatelike kaiju is clearly from a long line of the same species that lived on Fang Island — a rarity among kaiju. He is resistant to known forms of disease and poison and can regenerate damage well, and his species were clearly the alpha predators of Fang Island, but is the last of his kind with no sign of what killed off his kin. All objective analyses of him place him as a Tier 3, or at absolute best a tier 2 kaiju, but he has defeated numerous tier 1 kaiju and even fought Tsarkyrkon: God of Kaiju to a standstill. He was late to the global scene of kaiju, but was secretly encountered and captured by General Oil Company in 1933. He mostly ignores people, including residents of his island, but they consider him their legal ruler.

Ghengis Kong is 110 feet tall, and though his hide is among the least armored of any true kaiju (about on par with tough J-class creatures) he can apparently use sheer determination to remain focused and active even after taking horrific damage. His bite is his most damaging attack, but he is far more likely to use his fists or grapple foes. If he stays in one place long enough, thunderstorms gather around him, and seem to ignore him and focus wind, hail, and lightning at his foes. His greatest asset appears to be his intellect, as he is clearly at least as smart as a typical human (and possibly much smarter), and has a true tactical genius.

Although he doesn’t go on rampages unless attacked or the world is in serious danger, he recognizes the General Oil Company logo, and attacks it on sight, which GOC claims is random brutality and actually proves he lacks human-level intelligence.

Kravaithan: One or more tier 3 kaiju, Kravaithans are giant squidlike kaiju with acidic ink sprays and poisonous mucus generation. Fast in water but very slow on land, they regenerate extremely quickly, so it is unclear if the dozen that have been seen over the decades are different members of the same species, or if a cell or two survives each time it is destroyed and eventually grow back to its full 200-foot length.

Kulicidara: Essentially the anti-Vespira, Kulicidara is a tier 1 kaiju that looks like a massively over-armored and spiked mosquito. It was created in 1992 by GOC using Externian tech and a captured Vespira regeneration egg to make a kaiju able to prevent Vespira from interfering with their mining and drilling operations. Kulicidara can infect other kaiju with its long injector spike, then control them. It took control of Tsarkyrkon, and began to use the God of Kaiju to destroy anything not owned by GOC, but Vespira broke the control and helped the greatly weakened Tsarkyrkon destroy Kulicidara, though the effort killed her.

Larval forms of Kulicidara have been created several times since then, and have been dealt with by K-Force and/or Mega-Z before growing to full size.

Mecha-Deltara: After the death of Deltara, the General Oil Company (who ran numerous oil rigs near the scene of the battle) claimed the body. They refused all efforts by governments to confiscate or even see it. While neither the decision-making process nor the actual construction method used are known, between their acquisition in 1965 and one of Tsarkyrkon: God of Kaiju’s attacks on new oil wells drilled in the arctic in 1974, GOC turned the dead kaiju into a massive k-class robot, using the nearly indestructible bones of the kaiju as a frame, reinforcing its carapace for a layered armor exterior, and drawing power from the dead kaiju’s revived nervous system and k-cell infused organs to create a plasma beam. This was further augmented by missiles and canons tipped with bacteria that had been found able to consume k-cells, so they could (at least in theory) both penetrate another kaiju’s hide, and weaken its regeneration. Further, the Mecha-Deltara was piloted by a small crew of young pilots who had gained psychic abilities after observing Deltara in battle in 1965.

Mecha-Deltara was used by GOC in an attempt to defeat Tsarkyrkon. Though the Mecha-Deltara badly injured Tsarkyrkon, in the end the pilots were a weak link and even though no attack ever reached their control chamber, the mecha-kaiju itself being constantly smashed about eventually gave them concussions, allowing Tsarkyrkon to outmaneuver it. The failed mecha was reclaimed by GOC, repaired, and a new set of pilots trained to use stimulants to retain focus regardless of the concussive force they suffered. A second battle between Mecha-Deltara and Tsarkyrkon occurred in 1975, but this time the pilots’ hearts exploded after they insisted on using more and more stimulants in an effort to win.

Although GOC claimed the Mecha-Deltara was destroyed, redesigned and upgraded models have attacks Tsarkyrkon in 1993, 2002, 2003, and 2022. It has often come close to defeating Tsarkyrkon, but never done so.

Its current whereabouts are unknown, and GOC claims it was destroyed.

Mega-X: The true nature and origin of Mega-X are not common knowledge, though K-Force and most world intelligence agencies are aware. Mega X first appeared in 1966 and appeared to be an artificially intelligent, size-shifting robot, similar to the true robot Tiger Turbo. But in fact, Mega-X is a title granted to one Earthling at a time, who gains the power to transform into an armored “Mega-X” form, and to grow up to 300 feet tall. This title is granted by the Megarians, who granted it to a young man who had bravely helped people flee from one of the fights between Deltara and XJPT a year earlier, in 1965. Aware that the Void Gods had been sent by the alien Externians to weaken Earth prior to an invasion, and that one of Earth’s mightiest kaiju, Deltara, had died in trying to defeat it, the Megarians assigned a Mega-X guardianship over Earth, to help it defend itself against further Extarian kaiju attacks. Each time the holder of the Mega-X title dies or chooses to retire, the Megarians grant the Mega-X title to another worthy human. There have been five Mega-X holders since 1966, two of which are now dead, and two retired. One of the retired Mega-X guardians, Professor Hiroko Sahara, is now the senior civilian kaijologist at K-Force.

The Mega-X form takes energy from the human using it, and the bigger the Mega-X form, the faster it uses energy. Larger forms also require a warmup time in Mega-X form to assume, so Mega-X often appears on a scene, tries to help as much as he can in human-sized armored form, then grows to great size only when absolutely necessary, and maintains it for as little time as possible. Mega-X is heavily armored but also very fast and nimble, gains advanced combat training, can fly, and project power beams from his eyes.

Mega-Z: Mega-Z is typically just seen as a female form of Mega-X. In fact Mega-Z is the holder of a second Megarian guardianship (see Mega-X), who happens to be female and has been the only holder to date. Megarians granted the Mega-Z Guardianship in 2001, when a rogue Megarian decided to begin converting various Terran kaiju into Guardian Spirits, but had to destroy Tsarkyrkon: God of Kaiju to do so as they were all attuned to his dominance through GQS. Because a Megarian trying to destroy even one of Earth’s kaiju was a violation of Megarian law, the Megarians responded by granting Earth another Guardianship.

Mega-Z is much, more more energy efficient in her Mega-Z form than Mega-X, but otherwise has all his abilities, just at a lower power level. This makes her less effective in a short battle where Mega-X can unleash his more powerful abilities to win quick victory. But while Mega-X can retain his enlarged form for an hour at the most, Mega-Z can operate at full scale for days if she wishes to do so. The current Mega-Z is also far more experienced than the current Mega-X.

Petagan: Petagan is a tier 1 Externian cyborg kaiju, used by the aliens as one of their primary weapons of war. It can fly, has a graser beam eye ray, and has cybernetic claws and vibro-spikes. Petagan also appears to actually be a series of extremely similar kaiju, and on at least one occasion a dozen Petagans operated at once under the command of a larger, more powerful “Lord Petagan.”

Scythella, the Preying Mantis: The first Scythella was released from an antarctic iceberg in 1957, and rampaged up through North and Central America until it was finally destroyed in a pitched battle in Washington D.C. It is often referred to as a “weak” tier 3 kaiju as it can be affected by conventional weaponry, though its speed and agility makes it extremely difficult to hit, and it requires bunker-buster weapons to wound it at all. Additional Scythella kaiju were encounter in 1967, 1969, 1972, 2004, and 2019, and each time killed by another kaiju or by massive assaults by combined military forces. These are believed to have hatched from eggs on Hive Island.

Scythella can fly at just above the speed of sound, create deafening buzzing sounds, and has praying mantis-style claws capable of crushing buildings and the limbs of other kaiju.

Tarankura: Tarankura first appeared in 1955 in Arizona, and created mass devastation before being destroyed by a US Air Force Strike. The origin of that Tarankura is unknown. A second appeared in New Mexico in 1958, with similar results. In fact, Tarankura appears to be the *most* common species of kaiju. In addition to dozens of unconfirmed reports from various Pacific island encounters (many on the Kaiju Islands), additional appearances occurred in Colorado (1960), Nevada (1963 and 1968), Wisconsin (1975), Los Angeles (2000), New Guinea (2004), Los Angeles (again) and New York City (2013), Italy (2014), and the Taklimakan Desert (2021). A seafaring Tarankura was encountered by a fishing trawler in 2020, though details of the encounter are sketchy. In 2002, a massive wave of hundreds of Tarankura appeared in Arizona, ranging in size from 200-lbs to a single specimen weighing in at 8,000 metric tons. It is the largest number of Tarankura known in a single incident.

Tarankura all have k-cells, even those just born and found at the roughly 200-lb. size. Only those that exceed 1 metric ton appear to gain GQS, subseismic movement, and regeneration. All are extremely poisonous, prodigious jumpers, and able to spin weblines and traps with silk thread significantly strong than steel.

Teralon: A Tier 1 kaiju, Teralon was the last militarized kaiju possessed by a splinter Externian group living in the ruins of Atlantis. An insectile creature it could fly, has cyborg drill claws, and a biomass grenade launcher and mine dropper. It was destroyed by Tiger Turbo and Tsarkyrkon the God of Kaiju, but rumors persist of a Teralon-like creature being spotted in states of damage by various submarines and ships.

Tiger Turbo: Although neither biological nor naturally occurring, the size-changing AI robot known as Tiger Turbo is generally classified as a kaiju rather than hardware. The robot was originally constructed in 1973 as a prototype a remote-controlled humanoid analog to use in situations too dangerous for humans, such as disaster search-and-rescue. When the Externian splinter group living n the sunken ruins of Atlantis unleashed Teralon (and the standard Externians took the opportunity to also attack Earth with Petagan), Tiger Turbo’s creator was trapped in a wrecked building Petagon crashed into. Tiger Turbo was damaged, and its creator used pieces of Petagan to repair him, hoping to rescue himself and others trapped in the building.

The Exterian technology from Petagan was successfully grafted to the Earth robot, and caused it to gain sapience and k-cell powers, including the ability to fly and change size. Tiger Turbo assisted Tsarkyrkon in defeating Petagan and Teralon. Tiger Turbo has since continued to work as an independent global search-and-rescue force, but will also oppose rampaging kaiju if they threaten population centers. Tiger Turbo has an arms-length cooperative agreement with K-Force.

(Art by Jacob Blackmon)

Tsarkyrkon: The “God of Kaiju,” Tsarkyrkon was the first kaiju to make a major appearance in the modern era, attacking Tokyo for unknown reasons in 1954. He was driven off with a weapon of desperation, the Neural Suppressor, which kills neurons directly at a quantum level without having to propagate through any physical medium. Thousands of humans were killed by the Neural Suppressor’s collateral effects, and its creator destroyed it and all notes regarding it (or so he thought), believing Tsarkyrkon to be the only existing kaiju, and thinking him dead.

The God of Kaiju has remained active in the years since. He sometimes rampages, apparently driven by a sense of imbalance detected through his GQS or in response by attacks against him by various force, but also often moves to corral other rampaging kaiju, and seeks out and defeats alien kaiju (causing him to be seen as a major hindrance by the alien Externians). He otherwise spends most of his time on Omega Island.

Tsarkyrkon is a roughly 350-foot-tall, reptilian, bipedal, spiked, nuclear-fire-breathing kaiju with fangs, claws, and a long powerful tail. officially a Tier 1 kaiju, he is sometimes referred to as “Tier Omega,” classifying him as the most powerful of all kaiju.

Vragon: Vragon is a tier 2 kaiju, that essentially appears to be a quadrupedal version of Tsarkyrkon. He appeared in 1958, during a time Tsarkyrkon was thought dead (and was mistaken for some kind of mutated the God of Kaiju for a time), and attacked New York City. He nearly reached the UN Building, but was driven back through massive combined military efforts, including the use of Spine Missiles, literally tipped with bits of kaiju gathered off previous giant monster battlefields. His appearance was instrumental in the formation of K-Force as a worldwide organization.

Vespira: A winged, insectile kaiju, Vespira is the last Guardian Spirit kaiju, and through her reincarnation process the oldest living k-class creature. She is worshiped by a small but dedicated worldwide faith that claims to date back to before the evolution of modern man, and does seem to avoid harming her worshipers. Some Vespirians, mostly women, do seem to have psychic abilities (which they focus through song) that allow them to communicate with the kaiju, and occasionally even call to her. The most common theory among kaijologiests is that these “chorists” are from lines that have been in close contact with Vespira or her reincarnation hives to be infected and mutated through exposure to her K-cells, though there is no proof of this, and not even M.I.K.I. has managed to get any Vespirians to agree to be studied.

Vespira does not go on rampages unless provoked, and historically all such provocations have involved k-class creatures threatening her hive grounds (of which she has several hidden throughout the world), or groups of Vespirians being threatened. However, she also occasionally appears to oppose particularly destructive kaiju, even working with other k-class creatures when doing so. Numerous well known kaiju appear deferential to Vespira, and it is unknown if this is a sign of sapience, or a result of her being favored by those kaiju’s GQS. Even the mega-k-class Tsarkyrkon: God of Kaiju makes no effort at dominance displays toward Vespira and she has aided him against major foes more than she has any other kaiju, though she has also on a few occasions opposed him. Tsarkyrkon has even killed her once, though in doing so he was so weakened he retreated to enter a hibernation stage, and neither of them seem to keep a grudge about it.

In addition to the super-gigafauna size, strength, resilience, and baseline regeneration of all kaiju, Vespira possesses the ability to fly at near-sonic speeds, an area sonic scream (which she can reinforce with the buzzing of her wings if she is braced on the ground), razor-edged wings (which she can use to strafe with when flying, or as chopping weapons if in melee), and molecular acid sting. The sting is among the most devastating of attacks, perhaps more damaging even than Tsarkyrkon’s Nuclear Fire Breath, though her sting is a single target melee attack which takes hours to recharge and, if she is weakened, the strain of its use can kill her.

However, as long as she has at least one reincarnation hive, she eventually returns in either a larva or fully-grown form.

The Void Gods: The Externians sometimes use three kaiju known as the Void Gods to create chaos and distraction while they carry out other operations. Unlike Petagan and Teralon, the Externians cannot control or command the Void Gods, only place them in a state of hibernation through unknown (and imperfect) means, and let them lose someplace. They have only unleashed all three Void Gods once, in 1965, when it took the kaiju Deltara, Tsarkyrkon, and Vespira to stop them, and Deltara died in the series of conflicts.

The Void Gods are all Tier 1 kaiju. They are DTZR (a shapechanging, plantlike kaiju with control of air and earth), KLKQ (a flying, batlike kaiju with control over sound and fire), and XJPT (a flying, reptillian kaiju with control over gravity and lightning).


I’d meant to include notes on armor pods, Gunslinger Gamma, k-destroyers, m-destroyers, mobile armor pods, Striker-Ks, and Submersible X… but I ran out of time. I’ll add them in Part Three, out either Wednesday or sometime next week.

I have a Patreon. It helps me carve out the time needed to create these blog posts, and is a great way to let me know what kind of content you enjoy. If you’d like to see more system-agnostic worldbuilding, game industry essays, more rules for Starfinder or either edition of Pathfinder or other game systems, fiction, game design articles, worldbuilding tips, or whatever!, try joining for just a few bucks and month and letting me know!

The K-Force Files (Part 1)

(This article is not covered by the OGL).

My love of kaiju goes way… waaaaaay back to my early childhood. It predates my love of D&D, Star Wars, Star Trek, powered armor, space opera, pulp adventures, comics, superheroes, psychic powers, monster hunters, swords, or much of anything else I can thing of.

I believe it’s my first fandom.

It’s just grown as I aged. Some classic comics mixing superspy groups and kaiju, more modern kaiju movies constantly playing with classic elements such as mechakaiju, psychics, alien plots, and so on, just made me more and more want to boil down all the things I love most about it into a single set of worldbuilding ideas, and a single unified continuity, which I can then draw from as needed for various projects.

These are the K-Force files. You’re welcome to use them in your own home games, but mostly they are a look into how I build blocks of fungible lore and ideas that I can use as needed for various personal and professional projects. Part 1 covers Terminology, Locations, and Organizations.

Part 2, of course, covers some Kaiju.

(Art by Second F)


Gigafauna: Gigafauna much-bigger-than-elsewhere creatures that are not kaiju (as they lack k-cells, the physics-defying size, strength, and resilience of kaiju), but are extraordinary in one or more other aspects. Gigafauna are considered one class larger than megafauna, and are often J-class creatures.

Guardian Spirits: A popular theory among kaijologists is that while several strains of kaiju have always been primarily agents of chaos and destruction — serving to provide the same kinds of ecological and evolutionary forces as volcanos, meteor strikes, hurricanes, and earthquakes — that there were once numerous “Guardian Spirits” that explicitly protected early hominid settlements. While the theory is conjecture based mostly on cave paintings and the teachings of Vespirians, the appearance of Deltara in 1965, and Vespira on numerous occasions since 1961, can be seen as evidence for the theory.

J-Class: Study into kaiju revealed their native habitats (mostly the Kaiju Islands) are often inhabited with dinosaurs, megafauna, and gigfauna that aren’t kaiju but are at the absolute upper limit of what biological entities can reach in terms of size and power. These most often include sea life, turtles, reptiles, insects, arachnids, rodents, and ursines. Because they are “short of being k-class,” the casual term J-Class is often used to note their commonalities. Some kaiju are considered J-class in early, smaller stages of their development, such as Tarankura.

K-Cells: All kaiju that it has been possible to study possess k-cells, biological elements that appear to be independent power generators (possible drawing quantum 0-point energy) that fuel every part of a kaiju and are theorized to create quantum fields that alter the way fundamental forces (strong and weak nuclear forces, gravity, and electromagnetism) act on kaiju’s bodies (allowing kaiju to channel energies in ways other matter — much less biological matter — cannot). No Earthly technology has yet to create k-cells, though some have repurposed k-cells taken from kaiju and kaiju corpses, and humans exposed to k-cells sometimes develop psychic powers (apparently inheritable), or develop other mutations.

K-Class: Because there’s little evidence that all kaiju are related, despite common elements such as k-cells, super-gigafauna mass, subseismic movement, and GQS (Global Quorum Sensing), creatures that meet at least most of these features are placed in a single polyphyletic group referred to as “k-class creatures.” Informally, anything that is shown to be able to compete with the power of kaiju is sometimes referred to as being of “k-class,” such as referring to the mecha Gunslinger Gamma and the AI robot Tiger Turbo as “k-class machines.”

Kaijologists: Since the appearance of Tsarkyrkon “God of Kaiju” in 1954, the rush to understand these varied and violent life-forms that prove humanity is not at the top of the food chain has formed into the multidisciplinary study known as kaijology. Unfortunately, it is extremely difficult for a kaijologist to get extensive first-hand material to work with, and the field is renowned for producing both crackpots who make wild claims and psychopaths who consider their research more important than ethics or human lives. Despite this, every major world organization and learning institution has at least a couple of kaijologists on-staff… just in case.

Kaiju: A specific form of gigafauna, kaiju are enormous creatures standing 50 to 500 feet in height and possessing a series of traits that makes them distinct from just big creatures (see K-Class). The first kaiju known in the modern era (and arguably the most powerful) is Tsarkyrkon, the so-called “God of Kaiju,” who attacked Japan for unknown reasons in 1954. Because the first kaiju appeared in Japan, Japanese language and culture has a strong influence on kaiju naming and kaijology as a whole.

Kaiju are classified into tiers, with a dozen known Tier 1 kaiju that no known force can reliably stop, roughly double that in Tier 2 kaiju that require entire fleets and combined armies to even slow down, and scores of Tier 3 kaiju, which can be faced with massed firepower and are just one step above J-class creatures and typical gigafauna.

GQS: All kaiju seem to be aware of one another, even over vast distances and when separated by vacuum, and to be aware of large-scale changes to their environment (both current and upcoming). More powerful kaiju can sometimes use dominance displays to subdue other kaiju without physical combat, and even call on them over the same vast distances, but without any apparent language and possibly while lacking sapience. It is theorized that they do so as a result of being in-tune with some energy field that surrounds the entirety of the Earth, and that they all contribute and receive information using this field including territorial claims and pack leader status. Some psychic humans appear to be able to tap into this kaiju sense and communication network as well. Though the mechanism for this sense is not yet understood, the phenomenon itself is referred to as Global Quorum Sensing, or GQS.

Subseismic Movement: Kaiju are able to travel long distances without disturbing the medium of their travel, as long as they are not attacking, defending, or making dominance displays. Flying kaiju are often invisible to radar and listening stations, swimming kaiju do not impact the water flow around them and cannot be found on active or passive sonar, and kaiju walking or even burrowing through the ground do not set of tremors. Once a kaiju becomes more alert to and reactive of its environment, this disturbance-free effect ends, and they can often be felt miles away. The exact mechanism of this ability–called subseismic movement– is not understood, though it is believed to be another function of k-cells, and possible related to GQS.


The Kaiju Islands: A series of islands in the South Pacific that are the only territories known to have long-inhabiting kaiju in apparent balance with their environment. The Kaiju Islands are all extremely difficult to navigate to, with tides, winds, and even electromagnetic fields apparently directing travelers around them, no evidence of their existence visible by satellite, and fog, storms, and rogue waves

Fang Island: Fang Island is one of the smallest of the Kaiju Islands, and among the furthest from the main line of isle formations. It’s also the only one to show signs of constant human habitation going back to a Neolithic time period, despite being both the home of a few kaiju (most notably, Genghis Kong) and thousands of species of dinosaurs, megafauna, and gigafauna. It is governed by the Fang Island Protectorate.

Hive Island: The current residence of Vespira and headquarters of the Vespirian Religion, Hive Island has thousands of caves and secret “reincarnation hives” from which Vespira can be reincarnated. It has dozens of species of J-Class insectoids and arachnids, which for an unknown reason do not encroach of the area used by the Vespirans. The kaiju “Scythella: the Preying Mantis” and the spiderlike kaiju Tarankura appear to have come from Hive Island, and it is believed that eggs of more of those kaiju breeds lay dormant on the island.

Omega Island: Omega Island is the largest of the Kaiju Islands, and is where most active known kaiju (with notable exceptions, see Fang Island and Hive Island) have resided–when not on active rampages–since Tsarkyrkon “God of Kaiju,” subdued the majority of them in a dominance display at the end of Operation: Destroy All Kaiju in 1968. The disastrous results of O:DAK, and the fact civilization likely would have been destroyed if Tsarkyrkon had not ended the global rampages dozens of kaiju undertook following the U.N.’s efforts to end the kaiju threat once and for all. Many kaijuologists believe that Vespira “convinced” the God of Kaiju to do so, though they are split on whether this was just a case of her seeking balance using GQS, or a sign of higher-reasoning.


Externians: An alien species that works to weaken or destroy the world with kaiju-related plans, including being responsible to sending the Void Gods to Earth. Work with GOC (General Oil Company), but their existence is largely unknown outside the highest level of that corporation.

Fang Island Protectorate: The independent nation of Fang Island claims it is ruled by the kaiju commonly known as Ghengis Kong, and its government is just a protectorate under his control. Most nations of the world (and several multinational corporations, most loudly the General Oil Company) consider this a ploy for the tiny island to hide behind having a native kaiju that is protective of people born within its territory, and dislikes large vehicles, machines, and factories.

General Oil Company: The vast multinational corporate conglomerate GOC is one of the richest and most powerful nongovernment organizations on Earth. It is also deeply involved in kaiju incidents, issues, and politics, including the creation and operation of the hybrid kaiju-vehicles Mecha-Deltara. Unbeknownst to most outside the Fang Island Protectorate and GOC itself, this history dates back to 1933, when a GOC expedition attempted to take control of Fang Island for its vast, rich oil and mineral reserves, only to run into a young Ghengis Kong and his parents. GOC killed Kong’s parents, captured him, made plans to turn him into a worldwide sideshow and their mascot, lost control of him, and the controlling families lost several members of their upper ranks in the disaster that followed.

Though Kong swam home, the controlling board of GOC were the first modern worldwide organization to realize k-class creatures existed. They spent decades studying crackpot theories and ancient devices seeking to understand and monetize kaiju-related technologies. These efforts included raids on Fang Island to acquire the bodies of Ghengis Kong’s parents, and the bones of more of his ancestors, allowing GOC to be the first to discover k-cells. GOC was contacted in 1950 by aliens they codenamed the Exterians, who cut a deal to allow GOC to rule the world after the Exterians destroyed all major governments with kaiju attacks. GOC used Exterian technology to build a “GearGhengis” hybrid kaiju-vehicle, on the framework of Kong-kin bones, which they used to attack Ghengis Kong in 1966, and again in 1969. The GearGhengis was a crude cyborg operated by remote, but the experience allowed GOC to build the much more advanced Mecha-Deltara in the 1970s.

GORGON: GORGON is the secret and mercenary corps employed by the General Oil Company board to achieve their goals through extralegal means. The existence of GORGON is not publicly known, and the few who are aware of it outside GOC lack detailed information about its goals and funding and/or don’t have enough evidence to convince others. Even groups aware of GORGON at some level (such as K-Force) generally believe it is no more than than a ruthless terrorist organization determined to rule the world, and assume it is hired by GOC on an ad-hoc basis, rather than being a fully-funded and controlled subsidiary.

GORGON operates with numerous fronts, including several executive security and private military businesses (most notably the Basalt Group, FieldOps, an Redrock Contracting), criminal organizations (often arms smugglers and drug operation, including the Acrisio Cartel and AKR Weaponry) and terrorist groups (including Dreadfang, the New World Operation, and the Promethean Order). If a GORGON operation goes badly enough, evidence is created to assign all its activities to a cutout front, which is then allowed to be destroyed.

K-Force: K-Force is a branch of S.T.E.E.L. (Special Taskforce on Espionage and Enforcement of Law, an internationally empowered paramilitary group) that searches for, studies, monitors, and if needed fights Kaiju. It is based in Tokyo (with branches in other cities, including NYC), and has a small fleet of antikaiju mecha. The largest of its mecha is Gunslinger Gamma, the only mecha to ever defeat a Tier 1 Kaiju, but most are Mobile Armor Pods (designed to allow observers and scouts to survive being near kaiju battles). K-Force also has the Submersible X-Carrier for sea operations, and Striker K airships.

K-Force works closely with a few other antikaiju and kaiju-study forces, including the size-changing AI robot Tiger Turbo, and M.I.K.I. It is the only foreign group allowed a base on Fang Island. It is often at odds with the General Oil Company, and (though no one in K-Force can prove it) their secret illegal militant mercenary branch, GORGON.

K-Guard: A unit of K-Force that monitor and protect the Kaiju Islands. They mostly serve as early warning if a kaiju seems to be leaving the islands, and as guards to prevent anyone else from getting into the islands without authorization.

Megarians: An alien society that opposed interference in cultures such as Earth, the Megarians oppose Externian operations on Earth, but do so by granting two Guardianships on native humans, who gain the power to become Mega-X and Mega-Z.

Mentalist Institute for Kaiju Investigations (MIKI): Following the confirmation of psychic powers following the battled between Deltara and XJPT in 1965, numerous organizations have been created to study, train, and sometimes contain psychics, the oldest of whom are reaching their late 60s now. The oldest and most respected of these is the Mentalist Institute for Kaiju Investigations, based in Tokyo and founded by the only psychic known to have been at all five Deltara/XJPT fights in 1965. Rather than just study and train psychics, MIKI makes a major part of their activities to study Kaiju, K-cells, and the links between many psychics and some kaiju.

MIKI often works with K-Force, and some MIKI graduates are K-Force members, but leadership and funding of the two organizations are independent from one another.

Webburners: Officially “Task Force Minerva,” the Webburners are a unique, multi-component US military organization, made up of active Army and National Guard units, rounded out by U.S. Army Reserve support units. They are the US’s official North American kaiju-fast-response team, with a particular focus on dealing with J-class and k-class bugs (see Tarankura), which for some reason are the most common form of giant creature threat the US faces. Founded in 1960 with a five-year term, and renewed by every congress and president since. Originally just a fast response team, over the decades the Webburners have developed tactics, operational plans, and weapons designed specifically for dealing with kaiju and gigafauna outbreaks, rather than for dealing with other military forces.

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