I was on MP0 and still this guy literally stomped me to the ground. He seems to ignore all my pets and just get right in my face with a huge fire nova attack and some other nasty moves. I procced SV and barely ran away to the portal. Came back after SV reset, got him down to 10%, and it procced again! Luckily he went down, he wouldn't be so bad if he didn't ignore my pets constantly, guess he's programmed that way, so if I ever want to farm for the plan someday, guess im bringing a shield.
Just be careful out there my friends, Diablo is a joke compared to him, I did not prepare for this as well as I should have, but I got lucky.