Blood Lust

When a vampire goes too long without hunting, the body's natural instincts begin to take over, resulting in a blood lust. Most vampires experience a loss of control or temporary blackouts when possessed with a blood lust. It breaks down the average thought patterns and creates irrational behavior, giving the vampire the animalistic savagery that it needs to survive. However, while an effective way of hunting for food, it is best for most vampires to avoid such an involuntary response, for fear of exposure, and possible carelessness.