Sacred Institute

The Sacred Institute used to be the leader in the Nine Realms. It had a very high position. The founders of the Sacred Institute dispelled the darkness and brought light to human beings so that they could be the current ruler of the world. Unfortunately, humans were difficult to predict, too. As different worlds developed, people found the Sacred Institute was in their way, so they eliminated it.

It happened in both the Realm of Divine Martial Arts and the Realm of Nine Heavens.

 Know branches 

Nine Heavens Realm - Sacred Institute

True Force Realm - Sacred Marital Arts Institute

Divine Marital Arts Realm - Demon Slayer Palace