Blood of Cain (3.5e Maneuver)

''As you enter this stance the thirst for blood overtakes you. You must feed on all of them...''

You gain vampire-like traits, complete with a subtle change in appearance as your fangs grow and your skin turns pale. Your natural armor bonus increases by +6 and you gain a bite attack which deals 1d6 damage (for Medium creatures). You gain the Blood Drain, Damage Reduction, Gaseous Form, Resistances, Spider Climb, and Turn Resistance of a vampire. You count as Undead while in this stance, healing from negative energy and being harmed by positive energy. You also gain some of the vampiric weaknesses, being unable to stand garlic or holy symbols, unable to cross running water, and unable to enter buildings as a vampire. In sunlight they are staggered, but never destroyed.

For creatures which are already vampires and are in this stance, their blood drain increases to 1d8 Con damage and gain 5 temporary hp for every point of Con drained, their damage reduction becomes DR/bludgeoning, silver, and magic, they can assume gaseous form as a swift action, their resistances increase by 10, and their turn resistance increases by another +4. They are also able to tolerate the sun, though they are always staggered while in sunlight.

This maneuver is a supernatural ability.