The book "Reborn into a Pig, Invincibility Is All Due to Eating" fits your needs! The main character was reborn as a pig. In order to protect himself during the lich calamity, the main character set up a formation core and was in trouble. He almost starved to death. In the end, he became invincible and powerful through continuous evolution, becoming an existence that could look down on the heavens. I hope you like this fairy's recommendation. Muah ~😗