The Book of Destiny is a powerful semi-artifact, with its core being the Book of the Future, combined with the remnants of the God of Fate's body and soul, along with various rare materials.

The ancient city of Sagus is the only relatively intact relic of the Second Era discovered by Thalorian.

Thalorian organized multiple expeditions to explore it, investing heavily but reaping significant rewards.

During one such exploration, a high-level combat personnel in the team was a long-hidden doomsday cultist. Upon returning to the royal city, he stole the Book of Destiny, which they had painstakingly obtained from the depths of Sagus, and handed it over to High Priest Asa of the Polluted Sect.