Ironblood environments

Sunken graveyard - Ships and other debris sink to the ocean floor, from which a strange light emanates. The further one goes towards the surface however, the deeper the darkness becomes.

Nightmare’s respite - the edge of the nightmare, a rest point reached in places where the dream is weakest or after defeating a nightmare fount. This is not the true surface, but a glimpse of it. One can stay here indefinitely, but if one wishes to leave, the only way is back into the darkness. Time and space are warped here, so jumping into the whirlpool will send back to the ocean floor at the same depth they left it.