#60 - A Vampire Eat Vampire World - in A Cabin In The Woods
Here's a little loose lore being established here. Vampires can give themselves a social and magical boost by devouring (usually the hearts of) a vampires that are from a higher order than them. This guy is what is known as a Spawn-- he was once human and was turned into a vampire. If he devours Charby whom he has figured is a Pureblood (a living vampire) he may not become Pureblood himself but at least comparatively powerful to one. It will extend his influence beyond merely being able to control vampires he has personally turned (his coven) and extend to more general influence on vampires that are beneath him in amount of power they possess, though not on those actual Purebloods. He can't just go around eating other vampires and expect a power boost-- it has to have more magic than him. There are other, more magically powerful vampires, but they'd be impossible for him to kill on his own or even with the help of his lowly coven... but if he gets his teeth on a few more ones like Charby who look like an easy target, he could conceivably go toe-to-toe with some of the absolute beasts...
Also yeah I'm aware that Vampire: The Masquerade has a somewhat similar concept called Diablerie, I was unaware of it at the time!