Library of the Spirits

The Library of the Spirits (リブラリー オフ ス スピリツ, Riburarii ofu su Supiritsu) is a library of myth, legend, and science. It is said to have the largest accumulation of knowledge in the world.

Description
The only way to reach this library is through entering the magical Spirit Forest NW of Magnolia. Once you walk 3 days through the forest, you won't be able to breathe properly due to the pressure and humidity in the air. That's when the Spirit Forest Defence Force will detect if you're a spirit or not because only spirits are allowed to be in the Library. Humans and other races would knock out easily and whoever loses consciousness in the forest will wake up in the entrance.