Name: Bodily Immunity
Circles: ? / Augmentation
Description: Makes the target either roll 20 on all fort saves, automatically succeed on all fort saves, or gives a bonus of 10 or such on fort saves. Possibly gives DR as well.
Immunity is a big deal. Immunity is why Torin was OP. The description of this spell doesn't seem like this is a true immunity which means a name change is in order. It also means that this is an OK unit enchantment. This almost seems like the monk's diamond body feat.
I would not be in favor of an actual immunity except for special super tough monsters, but then only one immunity, and not multiple - so that you can still bring other damage types to deal with it.