Wandering Mansion

The Wandering Manor can appear within any other dungeon — it has no fixed location.\n\nIt manifests after a single explorer kills 666 of the same creature on the same floor of a dungeon. When it appears, all monsters in the surrounding area vanish as their D-Factors are repurposed to manifest the manor.\n\nThe Wandering Manor disappears at midnight local time of the dungeon it spawned in.