Classic of Mountains and Seas: I Evolve by Devouring Ferocious Beasts

In the world of Gaowu where ferocious beasts are raging, the protagonist's awakened superpower is to digest the flesh and blood of the ferocious beasts in "The Classic of Mountains and Seas" and replace his own organs with those of the ferocious beasts. When he dug out his own heart and replaced it with the "Heart of the Gu Eagle", people with superpowers around the world discovered that he had become a walking "mythical forbidden drug"