Temple of vaal high priest, Zoltec, cannot be damaged; temple cannot be completed

Cannot complete temple as zoltec, high priest took some damage initially, then went underground and completely stopped taking any damage. Had to leave temple and re-enter just to finish other rooms, but this last room is still unfinished. Have been trying for about 30mins(several attempts) and he isn't taking any damage at all. Logged out and back and that did not make any difference at all. Have to abandon this temple run. What a waste of my time. Last league i lost a scarce and very high value lineage gem(diallas desire) because coming calamity armour is bugged with herald of ash and spirit support gems. It is very frustrating to have spent money on this game and continually get shafted. Please address the things that do not work instead of nerfing everything that is good.