Thursday night four of us and Bronzebeard ran a lvl 4 delve only to be hit with unexpected and invisible damage out of the blue just past the first part of the tunnel into the room with mobs waiting. There was the Mushroom mini-boss immediately to our left as we entered and immediately we all were dead and Bronze was just sailing around on his mount.
No warning, nothing showed up on our debuff bars nor could we tell what killed us all. With only 5 lives to start with and then 4 getting demolished almost immediately after engaging this min-boss, there was no way our delve would succeed, we had to abandon it entirely. What a waste with such restrictions at only a level 4 delve.
Do not know what Bliz has done but its obviously a failure. You can’t adjust for something you cannot see or anticipate because there are no tells for it. Not even a sound from Bronzebeard or a whoosh or any other sound that could cue the players into incoming attacks.