The Great Tomb of Nazarick is a fictional location from the light novel series Overlord. It serves as the base of operations for the powerful guild known as Ainz Ooal Gown. The tomb is a vast underground structure filled with various floors, each containing unique environments, monsters, and treasures. Within the tomb, players encounter various NPCs, including the guardians who protect it. Notable characters include Albedo, the overseer, and Shalltear Bloodfallen, a powerful vampire. The tomb is designed to be a fortress, showcasing the guild's strength and the intricate world-building of the series.