Me and a few friends of mine encountered this fella at the archway near the arena. The group consited of me(50 rogue), 45 warrior, 52 cleric, 54 wizard and a 57 mage. Also we had a botted 65 chanter. We could hardly do any damage at all to this fella, either it has a LOT of hp or else it has insane regen rate. He kept resiting a lot of spells, so you need to tash him and bring a lot of damage dealers. Bevare if you are not fully prepared to meet an angry mob from hell...