Dunno if anyone noticed but if you hold a monster and wail on it with a puncturing dagger and do even 200 constitution damage, the monster doesn't die. I assume that's because, to inflate the HP while not throwing fort saves through the roof, Turbine added special HP boosting feats and other tricks to monsters instead of relying purely on constitution for HP.
Well, in the shroud, if I hold a devil, I should be able to 0 con kill him. And if I use an enfeebling weapon like my brand new Epic Spy Dagger, I should be able to drop something to 0 str and have it stop swinging at me! If I get 0 str, I can't use any items or swing my weapons or cast spells. And if get 0 con, I die. Why should monsters be so special?
Who cares if this encroaches on dreamspitter territory a tiny bit? That thing's pretty annoying to get anyway and you use it almost exclusively for epic quests. On epic, about 75-90% of attempts to drop any epic mob's stats fails automatically due to epic ward so puncturing and enfeebling wouldn't help kill epic mobs. There, everyone's happy. So change it! (and then put a save on ray of enfeeblement or everyone would alternate between natural casts and a wand of it to make a high level monster helpless in seconds)