[Brut]

Dark Assassin deserves a mention too, KOS 50rogue mob, the one in Feerrott roams like the entire second half of the newbie area and comes through trees to oneround people. Probably why all the smart ogres scoot to Innothule at lvl4.

And imo nothing mentioned compares to Mooto.
What sucks the most about a lvl10 goblin shaman running around an area designed for levels 5-9 is that shamans get SoW at lvl9. This bastage runs at chase speed around a huge chunk of the zone, and stops at every goblin camp to buff them up. Alot of the crap mentioned here is easy enough to strafe away from, but once Mooto caugh a whiff of your hairy feet you didn't make it to the guards.

(Special mention also to the early server dry bones skeletons who could instacast their burn DD on you without range/sight limitations. Cause of much dismay in Oasis.)