Easy solo as 40 shadowpriest, he runs slow enough for you to kite him with Shadow word pain, just keep it up at all time, if you get low on mana, for him not to evade use Vampiric embrace when u get oom, turn around, shoot with wand once and keep running..
took me 2 min to kill him, 674 Exp as 40. nothing big, just fun to do =) Advice is to kite him one way first, fear and kite the other way, just to make sure you dont pull adds.