layer 8 mort’regar final boss named watchers of death is unbelievably bugged. every other sec he casts an ability which you can not interrupt even half of them so he gets to damage you a lot and get healed for a huge amount of hp since you’re a tank I guess. there is no way of killing him.
I’m trying him now on Guardian. Have Mighty Bash, Incap and Skull Bash but thats not enough and he only gets to 80% before he’s unkillable and just keeps healing
