Royal Library of Banned Literature

The Royal Library of Banned Literature is a secret library built underneath the Royal Palace, rumored to have every piece of knowledge in existence. The King holds its key and it is guarded by several Library Guards.

Structure
The library is accessible through a staircase seemingly from somewhere within the palace. There is a giant gate just around the corridor which leads to the vast space inside, the library itself.

Inside the library, books are organized in shelves that are built as multi-stories buildings, stacked above each other. There are trees spread around the vast area and seemingly it has it's own sky. It also has rocky terrains and higher lands as well. Somewhere inside, there is a long table with a virtual computer installed to ease the process of finding specific books.

There are six pillars surrounding a certain ritualistic area that could be used to summon demons or release the seal placed upon them.