Hmmm. That brings up a point. Should creatures with the chaotic subtype be immune to the dissolution, since they're already kind of pure chaos?
Good point.
Well, I'd think that creatures with the Chaos subtype are not "pure chaos" per so, since they usually have some consistency in their attributes.
How about Chaos creatures take half damage, automatically make their Fortitude save, or take no damage on a save?
We still haven't set a dissolution damage - keep the original 3d6 or increase it?
I'm feeling 3d6 isn't enough. How about 3d12? Dodecahedrons don't get enough love.
Revising...
Dissolution (Ex): The touch of a nameless Limbo thing can convert any sort of matter into the random stuff of Limbo. Any time the thing hits with a pseudopod or grapples an opponent (regardless of whether the grapple succeeds), it deals an additional
3d12 damage by partially dissolving its target (Fortitude DC 19 half).
Creatures with the Chaos subtype take half damage, or no damage if they succeed at the Fortitude save. This special attack does full damage to objects and ignores hardness. If a creature is killed by a dissolution attack, its body dissolves into chaos, and the remains are insufficient for a raise dead spell to bring back to life. A nameless Limbo thing can suppress or resume its dissolution power as a free action. The save DC is Constitution-based.