Underground Tomb

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

Background
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 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 a school 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 served 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.

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.

Layout
Th 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.

Trivia

 * It was revealed by Ainz Ooal Gown that this facility is structured as a dungeon.