When I did Avatar of Sel-Makor on my juggernaut on my server he was doing 1.5k normal hits with 2.5k critical hits. I guessed it was bugged because as soon as he got down past 75% health 90% of my health would disappear in one single instant attack from him. I just bugged it and got a group to ping pong the aggro. Got him after the fourth try with a group.