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The darkness of the Nightmare Void continued swirling and spreading rapidly, constantly expanding, becoming larger, stronger, bigger. It spread through the entire world, beneath everyone's noses, not underground, but beneath their own plane of existence.
Constantly feeding on humanity's despair and their dark emotions, the Nightmare Void Sea continued growing endlessly, creating a dimension of its own of an even larger form and shape.
And amidst this strange, twisted Realm filled with the twisted nightmares and dreams of humanity, there was a gigantic castle floating above it.
The castle was constantly shifting its many floors, twisting. Sometimes it grew larger, and other times a bit smaller. Doors within opened constantly, as Nightmare Demons entered the castle, carrying with them bags made of nightmare shadows, filled to the brim with Dream Hearts.