The Symbiotic Demon Has Left, but I Am Still Invincible

Introduction: (Invincible + unchanged youth + no heroine + time travel + cool article) Another world, Blue Star, this is a strange world. There are symbionts in this world, and everyone has a chance to sign a contract with the symbionts when they reach adulthood. After humans sign a contract with a symbiote, they will gain the symbiote's abilities. Lin Yi traveled five hundred years to Blue Star, and contracted a symbiotic demon named Abyss-eating Black Demon. The Black Demons of the Abyss have a special ability - devouring. They can devour anything and gain strength through devouring. With the help of the Black Devil of the Abyss, Lin Yi went from an ordinary person to a powerful person in the mythical realm in just two hundred and fifty years. Moreover, he also became the most powerful person in Blue Star. Two hundred and fifty years later, the Dark Continent passage guarded by Lin Yi changed, and a large number of aliens tried to invade Blue Star. However, Lin Yi would not let them go. He fought against the nine alien god emperors alone. In that battle, Lin Yi defeated the aliens by killing three alien god emperors and seriously injuring two others. But not long after that battle, Lin Yi's symbiotic demon left Lin Yi and returned to his own world. The realms are divided into: Level 1 to Level 9, extraordinary realm, domination realm, legendary realm, and mythical realm.