Need Advice on Creature Adjustments · Game Master's Laboratory

Need Advice on Creature Adjustments

What are good weaknesses or bonuses for a creature possessed by an extraplanar being?

My players have added a magical 'storm' of mysterious origin to the world. This storm transforms people, beasts, and plants caught outside, causing them to become violent. They have punted some details to me to be uncovered during the game. I have decided that the storm is actually a remnant of a power extra planar being trapped in the world and just grouchy and angry about it with its emotions bleeding into others.

I want to create a creature adjustment to add on top of monster stat blocks, giving them a consistent flavor (rat -> transformed rat; vinelasher -> transformed vinelasher; guard -> transformed guard; etc). There is a nice blurb in D&D 4e DMG2 p101 and several examples in our system of PF2e (e.g. mana wastes mutant). I have tons of ideas for appearance, abilities, and effects.

I am looking for ideas on (a) damage resistances and weaknesses, and (b) adjustments to AC, saves, and perception.

We are playing PF2e, but I can likely translate ideas from other systems. I am really looking for storytelling ideas.

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