After transmigrating into the primordial world as Hongjun's son, he awakens an Eat to Get Stronger System. No matter what the treasure is, he can bite right through it, and eating it grants him a divine ability.
One bite of the Chaos Bell gives him an indestructible golden body, making his physical form comparable to an innate supreme treasure. One bite of merit grants him a golden body of merit, letting him kill without incurring karmic consequences. One bite of Primordial Violet Qi gives him a Primordial golden body, immune to the laws of the Heavenly Dao.
After eating every spiritual treasure in the primordial world and tasting every spiritual root under heaven, he discovers to his astonishment that he has become invincible.