Almost identically to my report of a similar issue in season 1, the Nemesis pack that spawned at the very bottom of the bottom-most set of double stairs in the main room fell through the world and is unkillable. I reported this last season as well with a Zekvir pack: Underkeep: Zekvir pack mob spawned and fell under world before I got there
The kicker this time is that since Underpin’s Nemesis packs don’t spawn until you get within ~50 yards of them, I was able to physically witness the enemy fall through the world as it appeared. Its pile of gold is also at the top of one of the claw-like spires above this set of stairs. As a result, I am screwed out of a max-upgraded Nemesis cache and thus the XP. Please fix this, finally.
