Also it's less annoying mechanic than just say 'you can't hit his AC unless you roll nat 20' or have other mechanics (like miss chance) to avoid a hit. Or use 'rocket tag' like in Exalted where whoever wins initiative is on your neck and kill you unless you got defenses up (Methu facing someone who charges him and dishes out 10,000 dmg per strike). So I have to sponge up opposition for stat damage somehow (as some of you break through immunities after all).<br/><br/>Or use reset functions as negative levels can be removed with contingency with restoration (or other mechanic) which cures subject from them. So instead one and same trick pony to all opposition I try provide some variety. More so you need IC realize the shadowy guy with Anansil came kill Methu (so he likely has mechanics vs Methu which works even vs his aura somehow, the hiding and such is part of his defense layers he has besides contingency).