Bloodletter

Bloodletter is a spell closely tied to Blood Seal Magic. it closely resembles a ritual, wherein the user absorbs the power of the user's demon weapon into themselves, covering the body in runes that form a sort of second skin that can grant the user near invulnerability to blunt and sharp forced trauma for a short time. It does come with risked however, as the user will be left susceptible to the absorbed weapon's influence.