In the dream, there were a few other things
Like blood cell centipedes

Alongside that there was also a giant worm (meant to be a parasite) in one specific gigantic room, once you killed it, you could take one of its wings from the body, and it'd give you something similar to an elytra, which would let you fly for a short period of time making it so you're able to travel through those weird looking areas with blood cells and vine-like strings

There'd also be Rot inside of it in some specific parts of the area since you're basically inside a corpse

Also, here's some extra things that were sketches I did before making more-proper concepts