You perform a ritual using the filament of a creature you wish to harm. Upon completion, a hand approaches the creature the filament belongs to and attempts to snatch their very life essence away from them. The target creature must make a Constitution saving throw. On a failed save, they take 4d8 necrotic damage. On a successful save, they take half. You heal for half of the amount of damage dealt as the hand returns to you and infuses you with the target's vitality. This ritual can only be performed against a particular target once per day.