Doing this quest on my level 70 destro lock and cannot for the life of me down this guy. Have used big cd’s multiple voidwalker summons and can’t even get him past half health on numerous tries. I don’t know if Blizz broke it when they worked on the level 70 scaling but he currently has 11.3m health and does crazy damage in the second wave (Usually about 3 seconds from healthstone from being off CD). Really annoying, I just want to finish the quest.
Any suggestions or ideas on what to do?