If I Change My Profession to Be a Heavenly Master in the Last Days, I Will Be Invincible

The alien race is invading wantonly, and the human race is on the verge of extinction. In order to resist the invasion of monsters, everyone will change their profession at the age of twelve. Ye Xiang obtains the god-level Celestial Master system by chance, and obtains the only hidden profession, Celestial Master, Golden Light Divine Curse, Invincibility from All Evils, Righteous Five Thunder Methods, Three Pure Divine Thunders, Qimen Dunjia, Talisman, Killing Alien Beasts and Massacre Aliens!