Apocalypse Class Change: I Am Instantly Invincible

Alien races rampaged freely, and humanity was nearly driven to extinction. To resist the invasion of demonic beasts, everyone underwent a class change at the age of twelve. By a stroke of luck, Ye Xiang obtained a god-tier Celestial Master system and gained the only hidden class, Celestial Master, along with the Golden Light Divine Spell, immunity to all evils, the Orthodox Five Thunder Method, the Three Pure Ones Divine Thunder, the Eight Gates, and talismans, slaying alien beasts and exterminating alien humans.