The sorcerer mystically claims one third of the Vitae that a subject imbibes. The subject must be within sight when this ritual is performed. Every time the subject feeds, a third of the Vitae he consumes is denied him and transfers invisibly to the sorcerer, regardless of either vampire’s location.
This Vitae is “neutral,” which is to say that the feeding Kindred does not subject the sorcerer to a Vinculum in this manner, and neither does feeding from a third-party vampire apply any blood bonds to the sorcerer (though it certainly does to the feeding vampire). The effects of this ritual expire after one feeding or the next sunrise, whichever comes first.
A contested roll is made to activate this power, pitting the sorcerer’s Manipulation + Occult + Crúac versus the subject’s Composure + Blood Potency, and this resistance is reflexive. If the most successes are rolled for the caster, the subject has no idea where some of the Vitae he consumes disappears to, yet he knows that he goes undernourished.