The apocalypse descends, and Earth expands tenfold. Apartment corridors become thousand-meter-long dungeon instances, elevator entrances turn into mechanical labyrinth instances, and lobbies transform into jungle instances. Even streets and roads become dungeons. Survivors around the world receive death notices: they must enter a dungeon within 24 hours. When Lin Mo grips a dumbbell and charges into a skeleton-filled corridor, no one imagines that this work-study university student will become the Necromancer Tyrant who makes the entire world tremble.