In the mysterious world of Fiendfell, there exist entities known as Dungeon Cores. These cores act as administrators of enigmatic dungeons, gaining sentience through a lengthy process of harvesting a power source known as G.P. However, not all Dungeon Cores follow this path.

The Dungeon Core of the Voidborne Catacomb—the most perilous dungeon in the world—is one such anomaly. It gained sentience the instant it inherited the memories of a man from a place of eternal damnation, a realm he could only call "Hell."

Reborn as a Dungeon Core, our protagonist embarks on a mission to acquire 'authorities'—a goal it is prepared to achieve by any means necessary.