I Butchered My Way to Power

Harvey was once called the finest sword talent of the Astral Sword Sect. Then his sword bones were destroyed and taken, and the sect threw him out. He ended up on the edge of a market town running a slaughterhouse, killing pigs for a living, with no cultivation left and nobody expecting anything of him. Killing turns out to be the thing that awakens what comes next: a system that converts slaughter into cultivation, so the butchering that was supposed to be his humiliation rebuilds his sword path one animal at a time. Princess Fiona, born into the royal house and looking for a way out of what that requires of her, recruits him. Harvey goes with her and keeps his strength hidden, letting people take him for the failure he was, and then settling accounts one at a time. He beats the sect's leading disciple. He goes down into the Sword Tomb after what is buried there. He faces a man turned demon. Behind all of it sits the matter of who ordered his bones cut out and why the sect covered for them.