Legend of Hieros Logos

Hieros Logos is the divine record of the world made from the leaves of the World Tree.

Background
The record is written in many old languages including Weissmin, Vestusa, and an unknown ancient language. The record has many authors compiled by a person with initials E.A. who wrote their name in Eisthes, which means that the records were only compiled recently as the Eisthes language only came to during the Dark Ages. Each page of the book is made of different fibers, and the oldest page dates back to 133 D.K. (around 7000 years before the present time) while the most recent page is estimated about 5000 years old (995 Y.Z.).

Summary
In every 243 years, the World Tree blossoms, indicating the time of a great misfortune brought upon by the irregularities the world suffers, bringing about the end of an era. At that point, holes on the world start appearing; the black holes are gateways to the Realm of Hel.

The Goddess Eudai Monia is said to reside in the World Tree, sleeping in time. When the tree blooms, she awakens from her slumber to prevent the loss of her world. She proceeds to increase the flow of luck, making the Spirits of the World materialize and their respective shrines appear.

When an era is about to end, a new one may not be able to rise. To prevent the world from reaching Ragnarok, a group of people blessed by the Goddess, the Heiros are born. Each Heiros is born in the light of their corresponding Spirits of Guidance to lead them to the World Tree, in hopes of saving the world. However not only one Heiros is led by a Spirit. Spirits choose the individuals they deem worthy to access the World Tree.