Diablerie
Diablerie — also called the Amaranth — is a term used by vampires to describe the act of drinking another Cainite's vitae to the point of Final Death. But as the "soul" is consumed with the heart's blood, the vampire's destruction is absolute.
Most vampires consider diablerie to be a heinous act, akin to cannibalism. As a result, the aggressor — the diablerist — loses some of their Humanity and is branded by black streaks in their aura that may persist for several years. Still, the practice holds a great deal of allure, for it is said to bestow the greatest pleasure imaginable to the diablerist — greater than the Kiss — and can also grant them greater power.
Diablerizing the soul of a Cainite of significant age is one of the few ways of lowering one's generation, for if the victim possessed more potent blood then the diablerist's, the diablerist's generation drops by one, possibly more if the victim was of notably lower generation. However, there is the risk of some portion of the victim's soul living on within the diablerist. Rumors abound of diablerists taking on the mannerisms of their victims, and even stranger tales speak of the victims consuming their assailants from within and taking over their bodies.
The Traditions of the Camarilla strongly forbid the practice, but the majority of the Sabbat and Banu Haqim consider it quite acceptable.