Ripheus23

Nightmare-hallows, the. Place dreamt into subsistence by the ur-destroyer, but not the same as the full parallel cosmos of the police defector and the fugitive. Source of the arcane demon which split itself into Sitra Achra and Amente after the old recreation of the world.

Above the Sea. Poetic name for the ur-destroyer's full dreamworld? Maybe. Well, somewhere, anyway...

("The angel could call them from realm to realm because it came from the dream, not of the ur-destroyer but the ur-creatrix instead. So half its essence was enough like the original world, and half enough like the shadow of the Nightmare-hallows, to conduct them accordingly...")