I'm having the same issue except with the crucible where you place the ore. I killed Grym and a few Lavabats in dead center.I tried thunerbolt arrows that are supposed to knock enemies back and I also tried taking a strength potion on Karlach to bring it to 21 so I can try to move,throw,or shove Grym out the way. the sad thing is out of all the molds I had I used the one I needed the least during the fight so now I have a mase I dont need or use.. Did you find a solution?
