ACT V Dirge of mire bugged

hi , in the quest Dirge of mire we need to attack the big wounded snake but it dont takes any damage i also tryed to change world tier but thats not the fix for it, anyone knows how to pass it?
hi , in the quest Dirge of mire we need to attack the big wounded snake but it dont takes any damage i also tryed to change world tier but thats not the fix for it, anyone knows how to pass it?
Comments
You must change world tier to "expert" and stay on it.