Realm of Gods and Demons: Defying Fate

For a million years, the Canglan Seal has imprisoned the Demon God. When Lin Tianxuan, a young man of the Lin clan, guards the altar, he unexpectedly becomes symbiotically bound with the Demon God, and is branded a curse by his kin. His elder brother burns his own eyes to fuel a escape, sending him to the Great Xia Empire. Bearing a unique constitution, he roams the world, meeting prodigies of all kinds, vowing to grow strong, return to the valley, rescue his brother, and rewrite destiny. — Description from novelcodex.org