I’ve wanted to do a full write-up for this adventure for years, but never had time. So, here’s a sketch of the general idea.

Players their PCs are all very junior angels–celestial outsiders who mostly sort through prayer requests to see what to pass up to higher ranks of the divine bureaucracy, but who also get an occasional flash of excitement by being summoned by the faithful to aid in a fight. The players should give their characters names and personalities, but not worry about game stats yet.

The PCs are spending time sorting through prayers, and notice that a specific priest keeps praying for guidance about the impending destruction of the Astral plane (the “Catastralphe”). There’s nothing in their sorting guidelines about that topic, so protocol is to take it to a one-rank-higher angel, who assures them there is not such thing, and to file the prayer requests under “mortal paranoia.”

Then, on their way back to their duties, the PCs are summoned… by that selfsame priest! She’s 1st level, so she can only keep them for a limited about of time.

If you are running this as a 5e game, the priest has used a scroll with a 1st-level variant of conjure animals, and gets the PCs as minor celestials instead, but can’t give them verbal orders and she can only concentrate on it for up to 1 minute. If this is a PF 2 game, the PCs are summoned with a summon lessor servitor spell and can be around for up to a minute if the priest is able to maintain concentration. If PF 1, it’s summon monster I to call up celestial animals for 1 round. If Starfinder, it’s summon creature at a 1st-level spell, again for 1 round.

Rather than just sticking with the creatures those spells normally summon, allow each PC to select a creature of the same power level to represent their summoned form, AND let them pick anything vaguely appropriate for their appearance. If the rules would let them be an eagle, but they want to be a winged housecat, let their imagination loose. Note to the players that they are celestial spirits in a temporal mortal body regardless. Death has no consequence for them here.

The priest doesn’t speak any of the languages they do, so they have to guess what she wants them to do — but they are summoned while she and four other people (clearly adventures — a fighting type in heavy armor, an arcane type, a sneak, and some kind of sage) are fighting for their lives (all already badly damaged) against what appear to be negative wind elementals (just use air element stats and have them do cold or shadow damage) in an ancient stone chamber that clearly depicts the Astral Plane being rended to destruction, and all the planes of the multiverse being flung apart (no longer able to connect to each other).

With a bit of luck the summoned celestial PCs can save the heroes (if not, just replace any that get killed in future encounters), and regardless of how the fight goes the PCs see that the ancient temple clearly has some real eldritch power connected to it, and the impending Catastralphe.

When their time is up, whether the priest and her adventuring party are safe or not, the PCs return to the angelic plane. They can take up the issue of whether the Catastralphe is real or not, but the celestial bureaucracy considers it to be much more likely that a set of junior angels misinterpreted what they saw than for there to be a true multiplanar threat the Angelic Host never heard of.

Later, the PCs get summoned again… but it’s clear that months have passed on the mortal plane, and the priest is now 3rd level, so she can use more powerful spells to summon more powerful allies. The PCs can maintain their appearance (or evolve it, perhaps from winged housecat to winged bobcat), get to choose new higher-level creatures for their ability scores. This time they are helping defend the priest and her adventuring allies who are being attacked at night, in an inn, by humanoid assassins who have no face, just a lamprylike fanged maws taking up the whole of the front of their heads. (Pick any CR-appropriate monsters and just give them new descriptions).

The priest is clearly surprised to see the PCs, suggesting they are not what she thought she was summoning, but she is also happy for their help.

Upon their return to the Angelic Host, if the PCs bring it up the event, they are directed to the Conjuration Control Department, where they discover there’s at least one other angel that believes in the Catastralphe, a planar traffic controller who is directing them to answer the priest’s summoning when she is showing to be near an important moment in her life.

The adventure goes on like this, with PCs working their way up through the ranks of the Celestial Bureaucracy, most angels not really believing in the interplanar threat, but grudgingly suggest the Pcs should look for specific clues when summoned. The GM should come up with a list of things — specific sigils, or eldritch currents, or the scent of the abyssal influence, so PCs can have investigating they can do when summoned. Meanwhile the priest continues to gain levels and summon the PCs with higher-and-higher level spells, months or years passing between the times they see her, and her quest is also clearly taking a toll on her. Some of her companions die, and are replaced. She loses and eye, from then on having an eyepatch when the PCs are summoned. At some point, she manages to learn their language, so she can speak to them when they arrive… but they can only go to her when she summons allies in a crucial moment in her life, so communication is always rushed during a desperate fight.

As the PCs gain influence among Angels, they are allowed to explore Forbiddings –places within the Heavens once kept by angels that fell and became devils. These encounters are to seek out lost lore on the Catastralphe, as their recurring encounters with cultists and supernatural entities on the Mortal Plane trying to kill the priest and her adventuring party suggest it might be real after all. However the Forbiddings are in the same heavenly reality as the PCs. While they use the same game stats as when they were last summoned for adventures in the Forbiddings, death there is permanent even for up-and-coming angels.

Eventually the combination of clues gained when summoned and when exploring the Forbiddings expose that the Catastralphe is real, and it is the eons-long plot of a fallen angel who wishes to rip the planes apart so it can become effectively a god of whatever bit of the multiverse it has access to after the Astral plane is destroyed. Once this revelation is in place, there are two more major encounters. First, the Fallen Angel can only be stopped with a weapon found in the most dangerous of Forbiddings, and that weapon can only be wielded by those who procure it, so the PCs must go get it. Second, the Fallen Angel’s ultimate base of operations is impossible for any celestial to enter without being summoned from within. So the PCs must wait for the priest to call them for aid one last time, and hope she does so in time for them to use their newly acquired relic weapon to stop the impending Catastralphe.

Obviously, this can be as quick as a 3-4 session mini campaign, or as long as a 1st-20th game, depending on how many encounters the GM decides to fill into this vague sketch of plot points. But I love the idea of Pcs being summon creatures (originally the idea was celestial badgers, back in 3.5 rules days), who have no fear of dying in most of their fights, but have to get anything they want done in the mortal realm done quickly, when summoned, while another fight is already going on. I also like the idea of players not having to make characters in any traditional sense, though it would be easy enough to let them pick special abilities as they “gained levels,” like being to reroll one attack roll per fight, or one saving throw, or teleport once, to represent their angelic nature growing stronger even as they hop from stat block to stat block as more and more powerful spells call them to battle.

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