Vampire race was created by one of the gods, and each of vampires surpassed him in the use of blood magic. Through their desires to the mystical power vampire race started a war with other magical races. Their action angered one of the older gods and he rained on them a powerful spell, removing the entire capacity of blood magic.
Now they must consume blood of vampires, not for power, but to survive. The other races congregated and chased the Vampires away, leading them to seek refuge on a small, desolated hill.
On the way to seek revenge, Vampires have begun to try different ways to regain the magic of blood and killing all the living creatures around the hill as a test.