The Mightiest Rat Immortal

He should have been the sect leader of the cultivation world, but he was ambushed and forced to self-destruct his primordial spirit. A fragment of his soul entered Earth, only to end up, by a twist of fate, inside the body of a spirit rat. How will he change in this unfamiliar world? Who in the cultivation world wanted him dead? If I can't have a human body, I'll cultivate as a demon instead and carve out a place for myself all the same. Follow a squirrel's step-by-step growth as it uncovers the truth behind its death.