When running the Delve: Underkeep. I entered the last phase of the delve where I am required to slay the three abominations by placing bombs to stun them. Upon stunning one of the abominations atop the stairs in the center of the map, I tried to quickly run down and stun another abomination. Upon running away from the first one atop the stairs, I found that it held somehow fell through the map. After slaying the one on the bottom of the stairs, I ran around aimlessly to try and get the mob under the floor to reappear. Nothing seemed to work.
While trying to figure out how to submit a bug report, and standing in the center of the map, the abomination that had fell through the floor had magically reappeared on me. This took about five minutes or so. I’m thankful that I was able to complete the Delve because of this. But others may not be as fortunate.
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Thank you for submitting this, Mousebutton! I actually did just submit this as a bug report, as I’m unfortunately not having the same luck with the abomination respawning. 
EDIT: Aaaand, I just found out that dying does indeed fix this. Despite not having any other enemies left, those rotating freezing devices did the job!
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This happened to me as well. I found that they did not fall through the floor when I engaged them in the main atrium.
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Bug still exists and dying was required to fix it.
1 Like
aye, in T8 and the last one fell through the upper platform at 68%
guess I’ll die…
Also, when I resurrected, the Abomination was still beneath the floor but he did bounce, bounce, bounce back up top and I was able to engage him at the bottom of the stairs.
I guess the rule is, do not fight atop the central staircase?
If this happens and you’d rather not eat a repair bill, force close the game and wait a few minutes. When you come back in, your delve progress will be where you left off, but the abomination will be back running its path for you to stun and kill again.
2 Likes
Just happened to me, very frustrating, so this bug is still happening. Be careful.