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Underground Tomb is a facility of the Sorcerer Kingdom built by Mare Bello Fiore.


It was made underground on the outer parts within the fortress city of E-Rantel. The underlying process for this facility's creation was done through Mare's method of digging it.

During his discussion with Pluton Ainzach, the Sorcerer King has made it his objective of making this underground tomb a training facility for adventurers. The practical training method to make adventurers become stronger over the course of time was to provide them live combat against monsters who are placed in the facility.

Considering that adventurers need to get used to team combat as a party, Ainz considers it a good idea to build such a labyrinth for them to delve into during their exploration. Nonetheless, the part of the monsters they would be squaring off against are filled by the Great Tomb of Nazarick’s naturally spawned POP undead dispatched there.

Since the facility's staff would be composed of the undead, who did not require salaries, the operating costs would not be too high compared to relying on humans which is deemed as more costly.

Ainz describes the facility to be his top priority in the Sorcerer Kingdom as he is setting it up to be school-like where adventurers can do their training at. If circumstances permitted, he considers also making use of the Adventurer's Guild for the task when the need arise.

He thought the facility would serve as a sign of hospitality to prepare a hostel for the volunteers who had traveled a long distance to seek him out there. The novice adventurer's instructors would be those veteran adventurers who had chosen to remain within the Sorcerer Kingdom and work in the facility.[1]


The Ruler of Conspiracy Arc[]

Main article: The Ruler of Conspiracy Arc

According to Ainz Ooal Gown, there were no plans to utilize this newly-made facility right away. It was simply because he had the manpower to spare but nowhere to use it.[2]


The setting of this facility can only be found beneath the surface of the ground as it was dug. Ainz planned to have the facility be given simple stonework through the use of Mare's magic.



  1. Overlord Volume 11 Chapter 1: Preparing for an Unknown Land
  2. Overlord Volume 10 Chapter 1: The Sorcerer Kingdom of Ainz Ooal Gown
  3. Overlord Volume 10 Epilogue


Re-Estize Kingdom
Re-Estize Ro-Lente Castle Magician's Guild Re-Blumrushur Re-Robel E-Naüru Re-Uroval E-Pespel
Baharuth Empire
Arwintar Grand Arena Imperial Castrum Ministry of Magic
Roble Holy Kingdom
Hoburns Kalinsha Loyts Prart Rimun Debone Great Wall Holy Kingdom Liberation Army Base
Sorcerer Kingdom
Great Tomb of Nazarick Log Cabin E-Rantel Katze Plains Carne Village Monument of Ruin Great Forest of Tob Abelion Hills Great Lake Underground Tomb
Elf Country
Crescent Lake Great Forest of Evasha
Dwarf Kingdom
Feo Jera Feo Berkana Feo Teiwaz Maze of Death Great Rift Feo Jera's Garrison
Other Locations
Eryuentiu Azerlisia Mountains Sea City Sasasharu Ruins Silent City Bown Swamp Rhynd Sea Sewage Treatment Plant Vadis Free City Quarry Tide Pool