Fusion Beast: Origin

I once thought that what my father left for me would be a fairy sword with his last name engraved on it, or a book of supreme skills that pointed directly to the great road. It wasn't until I crushed the first demon core with my own hands and felt the violent power rushing and roaring in my body, and finally meekly turned into a part of me, that I suddenly realized—— What he left to me was an entire wild world that needed to be conquered.