Curse of Blood was a Mastery 3 maho air spell which allowed the caster to touch and mark a target with his blood, that would adhere and sink into his skin. The process was painless, and could be done while the target was asleep or not paying attention. The target became fascinating to kansen, who woulld work all manner of mischief for no other reward than the target's frustration. Another version of the spell cursed the Maho-tsukai's killer with the caster dying breath. The spell could be cast ahead of time to take full effect when the caster died in a violent manner. The curse induced hemophilia, causing the recipient to bleed from any wound. Once laid, a mortal curse was exceedingly difficult to lift.