Dark Heart of the Dreamer is a setting toolkit torn from the pages of the Planarch Codex, the lost gazetteer of the planes.

...inspired by classic RPGs such as Planescape, Eberron, Everway, Exalted, Shadowrun, Freeport, Dark Sun, Wormwood, Tribe 8, Earthdawn, Warhammer Fantasy, Elfquest, Pirates of Dark Water, Agone, Engel, The Shadow of Yesterday, Talislanta, Artesia, Empire of the Petal Throne, and so forth.