Nazarick is a fictional location from the light novel and anime series Overlord. It serves as the base of operations for the main character, Ainz Ooal Gown, who is a powerful undead overlord. Nazarick is designed as a massive underground dungeon, featuring multiple floors, each filled with unique environments, traps, and powerful guardians. The Great Tomb of Nazarick is home to various NPCs (non-player characters) that were originally created by Ainz and his guild members. These NPCs have their own personalities and abilities, making them formidable allies and foes. The tomb is a central element of the story, showcasing themes of power, loyalty, and the complexities of leadership.