First shown to him by the black bull treasure spirit in book 4 chapter 5. After completing the complicated Rites of Bloodforging for a weapon, the weapon can then absorb various auras in order to become more powerful. The speed of its strengthening depends on how many are killed and how powerful they are. This technique has the secondary effect of allowing the user to change the weapon's size and weight to any preference. This is the first technique of its type discovered by Ji Ning and is later discovered to be a relatively crude and weak technique. This was used to strengthen Ji Ning's Darknorth swords and was later replaced by the more powerful Armaments of Sin technique.