The Great Tomb of Nazarick is a fictional location from the light novel and anime series Overlord. It serves as the base of operations for the character Ainz Ooal Gown and is known for its vast size and intricate design. The tomb is divided into multiple floors, each featuring unique environments, powerful guardians, and various treasures. Constructed by the Great Tomb's former guild members, it is filled with undead creatures and loyal NPCs. The tomb is a representation of the guild's legacy and is designed to protect its secrets and treasures from intruders, showcasing the power and influence of its master, Ainz.