The Demon Realm's Primordial God

Armed with the Heavenly Eye, the most powerful cheat imaginable, he transmigrated into a fallen sect whose spiritual leyline had been stolen, becoming a menial disciple with abysmal talent and comprehension. How will the protagonist make his way in this world despite his mediocre aptitude, laugh in the face of immortals and demons alike, and ultimately become a god of the demon realm feared by both?