Similar to the Fiendgod Bloodforging technique, this allows one to continually strengthen a weapon. It absorbs hatred and resentment and works much faster and more perfectly than does Fiendgod Bloodforging. It allows a weapon to strengthen all the way up to becoming a Chaos weapon. This was found on the stone stele Ji Ning found, which also contains a prison world. First seen and explained in book 19 chapter 24.