Blood is a life fluid and, as a power source, is a powerful form of life magic.
Denizens of the Cosmos
Professions of the Cosmos
A blood death knight is dark guardian who manipulates and corrupts life energy to sustain himself - or herself - in the face of an enemy onslaught. In undeath, some death knights find a special affinity for the blood and bone of the living. They carve into their enemies, sustaining themselves with deadly sanguine strikes, while using the bloody, shattered remains of the dead to fortify their own defenses. These crimson-soaked knights bend the very rules of mortality to control the frontlines of the battlefield.
Dimzer the Prestidigitator: "The blood of my allies shall add fuel to our fire!"
Gahrunt Foulfang: Martyrs instill morale, the damned instill bloodlust.
Warlocks are magical practitioners who seek to understand darker, fel-based magics, including destructive spells. Blood is a pure offering to those who give warlocks their vast powers. Warlock magics, demonic powers of entropy and destruction, can make beings bloodthirsty warriors.