Hi - this boss is super buggy. First it got stuck in the floor and wouldn't move or take damage so I travelled back to respite. When I returned to the boss arena it was no longer in the room - totally empty room. Can't progress now. I reset the realm in an attempt to fix it. I now cannot enter the well to even get to the boss. I completed three bastions of agility again to see if that would lift the shield but I still die when I go near it. This should probably also be looked at...Fwiw though the update is amazing! You guys did a fantastic job :)
Same issue here. Died, came back in, completely vanished.
I was able to fix mine and defeat Shaliak's Yoke fight. First I reset the realm. There I did three marked agility challenges (not sure if this is actually required). This didn`t open the observatory, but I flew in through the top. Did the challenges inside, got the protection. Went down the well again, solved the well puzzle, and went through the teleporter near the flight survivor. The fight didn't glitch this time!
I have the same issue. Sheliak got stuck on immune just like in the other post about this boss, and I decided to leave it for the night and come back to see if it would reset. When I reloaded the game the next day (today) the giant scarab had disappeared from the room. I can't finish this quest at all now.