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Converting PF1 spells to Starfinder: Ablative Sphere
Still converting Pathfinder 1st edition spells to Starfinder, and going back to alphabetical order, with ablative sphere. (You can find an index of the spells that have been converted to-date here).
While the original spell works very differently from this, having just converted ablative barrier, I liked how this rewrite ties into it to form a logical family of spells. This isn’t a perfect match for the original PF1 spell, but works well with Starfinder’s combat assumptions and is still a great hook for a spell.
Ablative Sphere
Classes mystic 3-6, technomancer 3-6
School abjuration [force]
Casting Time 1 standard action
Range touch
Area 10-foot-radius sphere
Duration 1 minute/level
Ablative sphere is a force effect that creates an immobile 10-foot sphere of defensive energy centered on one corner of your space when you cast it. It grants protection as a force field to any creature within its area, against any attack or effect from outside of its area. It has no effect on attacks against targets outside its area, even if the attack’s line of effect passes through the spell, nor on attacks originating within its area (even if they target a creature also in the area). All creatures within an ablative sphere share a single pool of temporary HP granted by the spell, which regenerate at the beginning of your turn each round.
The temporary hit points from an ablative sphere do not stack with those from an actual force field or an effect that specifies it functions as a force field (such as ablative barrier). If you have such temporary HP while within an ablative sphere, each point of damage done lowers the temporary HP granted by both the sphere and the force field effect. When you cast this spell, any previous ablative sphere you cast ends. The type of force field the ablative sphere emulates depends on the level of the spell.
3rd Level Spell: Brown force field
4th Level Spell: Purple force field
5th Level Spell: Black force field
6th Level Spell: White force field
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Converting PF1 spells to Starfinder: Ablative Barrier
Still converting Pathfinder 1st edition spells to Starfinder, and going back to alphabetical order, with ablative barrier. (You can find an index of the spells that have been converted to-date here).
Reading the original spell, I was amazed how much it reminded me of how force fields work in Starfinder… which isn’t a perfect match for the original PF1 spells, but works well with Starfinder’s combat assumptions and is a great hook for a spell.
Ablative Barrier
Classes technomancer 2-6, witchwarper 2-6
School abjuration [force]
Casting Time 1 standard action
Range personal
Duration 1 round/level
Ablative barrier creates a force effect that functions as a force field, but does not require an armor upgrade slot, and does not use a battery. The temporary hit points from an ablative barrier do not stack with those from an actual force field (if you have both, each point of damage done lowers the temporary HP granted by each by the same amount). When you cast this spell, any previous ablative barrier you cast ends. The type of force field the ablative barrier emulates depends on the level of the spell.
2nd Level Spell: Brown force field
3rd Level Spell: Purple force field
4th Level Spell: Black force field
5th Level Spell: White force field
6th Level Spell: Gray force field
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Converting PF1 spells to Starfinder: The Shield Spell
So, back to converting Pf1 spells to Starfinder. (You can find an index of the spells that have been converted to-date here). A member of my Patreon asked I tackle the shield spell next, rather than wait until I got to it in alphabetical order, so here we go!
Shield is a fascinating example of a spell that is trickier to move from Pathfinder 1st edition to Starfinder that might first appear. Obviously the effects of the PF1 version can be translated directly–at least if you are using the Character Operations Manual, Starfinder has rules for shield bonuses to AC. But looking at the tighter math in Starfinder, and the fact that all spellcasters in that game have access to at least light armor, it becomes pretty clear a +4 bonus to AC as a 1st-level spell would be game-breakingly good.
So, some analysis is called for. Can we make a version of shield that is both true to the concept of the Pathfinder version (if not the exact numbers), and yet a viable option to add to Starfinder games without ruining anything? Well, let’s look at what shield does in Pathfinder, in a comparative context.
In Pathfinder 1st ed, the shield spell gives an advantage almost as great as a 1st-level character can get with the best shield (tower shield), but without any of the drawbacks (penalties to attack, weight, and so on) or as many options (no setting it down to gain total cover from weapon attacks). It also neutralizes magic missile, which is a minor point, but one worth remembering since we have magic missile in Starfinder.
So, seen in that light, it becomes clearer that a Starfinder-compatible version of shield needs to mimic what a a level 1 piece of equipment can do. Looking at 1st-level shields, that gives us a better idea of an appropriate power level for the spell. Of course, Starfinder also has tiered spells, so we can also make higher-spell-level versions of shield, if we are so inclined…
And I am.

Shield
Classes technomancer 1-6, witchwarper 1-6
School abjuration (force)
Casting Time 1 standard action
Range personal
Duration 1 min./level (D)
Shield creates an invisible shield of force that hovers in front of you. It grants you a shield bonus to AC, which may be higher if you align your shield against the foe as a move action (see aligning shields in Chapter 4 of the Character Operations Manual). Additionally, if you align a shield against an incorporeal or ethereal target the force effect of the shield grants you an additional +2 AC against that creature’s attacks.
Level 1: Shield bonus +0/+1. Additionally, you are immune to damage from magic missile while the shield spell is active.
Level 2: Shield bonus +1/+1. Additionally, you are immune to damage from all 1st level spells with the force descriptor.
Level 3: Shield bonus +1/+2. Additionally, you are immune to damage from all 2nd-level and lower spells with the force descriptor.
Level 4: Shield bonus +1/+3. Additionally, you are immune to damage from all 3rd-level and lower spells with the force descriptor.
Level 5: Shield bonus +1/+4. Additionally, you are immune to damage from all 4th-level and lower spells with the force descriptor.
Level 6: Shield bonus +2/+4. Additionally, you are immune to damage from all 5th-level and lower spells with the force descriptor.
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