Deep below the throne room is the crypt, home of the dead. Heroes of old were laid to rest down in the snaking labyrinth. This is a dangerous area. There is a darkness that permeates. If the player is not prepared, they won't get far.
The crypt tileset is used to create a vast underground network where roots from the trees above jut through the earth and in some cases block passage forward.
Castle Dungeon Library Wine Cellar