Change the Soul
This power is seen as diabolical by those few Malkavians who have heard about it. However, those elder Malkavians who follow the Road of Sin or who revel in their madness may consider it more blessing than curse. With Change the Soul, a Malkavian may alter a person's personality on the deepest level - her memories remain intact, but her outlook on life changes completely.
System: In order to inflict Change the soul on a victim, the Malkavian must look into the eyes of the target. The player rolls Manipulation + Subterfuge, with a difficulty equal to the target's Wits + Subterfuge. If the user can achieve success equal to or greater than the target's Instincts/Self-Control, she may change the target's Nature to whatever she desires. This effect is permanent and can only be reversed with another application of Change the Soul or with Touch of the Saints. Rumor has it that certain powers of the Healer path of Valeren can also counteract Change the Soul. Should the attempt be botched, the Nature of the user changes to that chosen for the victim.
Note for Storytellers: This power is quite a nasty one, and it is probably a good idea to think it through before inflicting it upon a player's character. Players who spend a lot of time, though and effort on their characters might not appreciate having such an essential part of their characters changed.