"background lore on her that I randomly came up with her while drawing, she used to be held captive and was trying to strike off her ankle cuffs and accidentally hit herself while trying to break free. She managed to manifest a weapon out of the iron of her and her captors blood and destroyed the chain. The "Thousand Corpse Cleaver" is pure blood-iron, the name not given from slaying a thousand people, but being made from innumerable enemies - it'd be closer to 100,000 adult humans to create a cleaver of such size."