As you'd be walking through the abandoned Halls of the Hadal Blacksite, you'd soon stumble across a room infested with Rotten Coral, taking a moment to somewhat admire the cool Moss-Like Coral before soon advancing to the next room.

but without knowing, a Wall Dweller would get out of a wall in the Rotten Coral, quickly beginning to walk toward's you, sneaking up on you, ready to consume you.