I've long been fascinated by the Strength drain effect of Called Shot, the Dexterity drain of Haer'dalis' Chaos Blade, and the Intelligence drain of the mind flayer attack from Shapechange. They were a very unique method of killing enemies that bypassed immunities.
Then EE removed the exploit by making plot-immune critters impossible to kill via stat drain. This prevented the player from accidentally breaking the game by killing a character played a critical role in the plot, but it also made stat drain useless against all kinds of bosses. One of the coolest ways of winning a fight had suddenly become rather limited.
This mod changes that. It doesn't allow you to kill
plot-immune critters, but it does allow you to win a fight against one just by using stat drain. If you reduce any ability score of a plot-immune critter to 1, they will drop to 1 HP and trigger any dialogues or scripts or cutscenes that are supposed to trigger when you defeat them (trolls will fall down; Kangaxx will transform; Irenicus in Spellhold will flee; Abazigal will give his death dialogue; etc.). Kudos to @subtledoctor
for making this mod possible.
It also lets you earn XP from stat drain kills, but only for vanilla items and spells (mod-introduced methods are unaffected): Called Shot, mind flayer attacks, the Chaos Blade, and Kachiko's Wakizashi. Basically, I just rigged them to set HP to 1 and then deal a bit of magic damage to finish them off whenever their ability scores got low enough.