An ultra-high-difficulty dungeon located deep within the Dogua Forest. No one knows the truth about its deepest depths or its true ruler. No one has ever reached the bottom. Adventurers have a ranking system: Copper, Iron, Silver, Gold, Mithril, Orichalcum, Adamantite. *Adventurers may lose their lives within the dungeon. Those who die or lose consciousness are forcibly transported to the dungeon's entrance.