Drink of Lethe's Waters
Description: The necromancer acquires an object once owned by, or symbolic of, a particular wraith. The object must be able to be damaged by water; the necromancer destroys it by leaving it to soak in water. During the soaking, he periodically spits in the water. After the object has been destroyed, the necromancer conjures up the wraith or otherwise arranges to be in her presence. The wraith loses all memory of her identity, becoming highly susceptible to suggestion on the part of the necromancer. The wraith's memory loss continues for one night per success. It may not use Pathos point to counter any action from the necromancer. Its Willpower drops by the number of successes scored; it may not replenish its Willpower pool while the effect lingers.
Reference: A Giovanni curse of Greco-Roman origin. Blood Magic – Secrets of Thaumaturgy - pg 106.