|Luck & Pluck|
Saturday, February 20, 2016
So, if a character has an advantage, their is an equal but negative disadvantage that removes that advantage. So, the corresponding disadvantage for Injury Tolerance (Undead) is No Injury Tolerance (Not Undead). Similarly, the opposite of Injury Tolerance (No Vitals) is No Injury Tolerance (Vitals). These two disadvantages combined look like this:
Revitalized (-10%): No Injury Tolerance(Vitals, Not Undead;Sorcery -10%) [-22]
So we are inflicting a -22 disadvantage on an enemy. To strictly limit this to undead enemies, we give this a 0% feature. It doesn't make sense to me to give an automaton vitals. Putting this on an affliction we get this:
Revitalize(+87%): Affliction(HT, Sorcery -15%; Disadvantage, Revitalized, +22%; Malediction 1, +80%; Fixed Duration, 3 minutes, +0%; Feature, Undead Only, +0%) 
When used, the characters have a quick contest of HT, failure means the undead target no longer benefits from tolerance to impaling weapons.
If you really want, you could take off the Undead Only feature, but I don't think it makes sense. Obviously, based on this spell, someone could invent other attacks to disable other types of injury tolerance, but injury tolerance is a special case kind of advantage, and the fluffy repercussions of removing diffuse from a swarm of wasps could be kinda mind rattling... or pretty flavorful I guess. A lot of zombies have injury tolerance no brains as well. A version of this spell that would cancel that advantage would cost  all told.