Blood Weapons are weapons made from the blood and body parts of Marchens and the primary weapons used by the Blood Maidens.
These weapons are extremely powerful, but contact with Marchen blood can gradually induce Corruption in a Blood Maiden, causing them to go berserk and enter Blood Skelter. Jack's blood is capable of purging Corruption, though this same property causes Blood Weapons to rust into scrap in his hands. There are 18 different types of blood weapons.