Hey, two posts in one sitting. Very rare :)
I'm curious about what monsters people GEN when they get the spell. For me, I will always go with Nagas. They are the most annoying creatures that you encounter in the dungeon. They are difficult to hit, they have a lot of hit points, you can't use SLE or WEB on them. They can rust your armor, un-enchant your items, and worst, they can pickpocket you like a Nymph. (I just recently was heading out of the Volcano and a naga popped up and stole the potion of cure dianthorritis!)
I have to say, that one of the few additions I liked in ULARN was that you could find the Nymph or Naga that took your stuff and kill them, and you'd get the last item of yours that they stole back.
So what other monsters do people Genocide?