About the Life of the Great Sage Rumidite

About "The Great Sage" Rumi Dieter, The world only knows that he was canonized at the age of eighteen, alongside the Three Heroes. Sighing sadly at the ending when he disappeared together with the Central Continent. Few people ask: Why is a person who voluntarily gives up his reputation called a sage? What is it that he has spent his whole life studying? Did he find the answer before he disappeared?