Blood is the currency used in the Vampire Wars game. It can be used to buy Abilities and Minions. You get Blood by completing Missions, winning Fights against other player Vampires, and earned hourly through Minions. Blood is required as hourly Upkeep for some Abilities. You lose your Blood when you lose Fights, or if your hourly Upkeep is higher than you hourly Gain.
Blood can sometimes be taken as a reward for Missions and used to purchase certain Avatar items. It can be lost if you fail to complete a Boss fight.
Blood can be used to purchase Domains.