Blood Magic

"In order to give, one must take away. That is the fundamental law of Blood magic."
-The Hajaari Encyclopedia

Blood magic is simultaneously one of the most beneficial and detrimental of the schools of magic. It has been used by clerics and priests to heal the wounded, but also by exiles to curse innocents who crossed them.
Those who specialize in Blood magic have the ability to heal allies, hex their enemies, and even enchant things. But all of this comes at a cost, the blood of the caster--hence why the Hajaari do not have the ability to harness it.

Effect

Healing allies at the cost of their own health. Cursing enemies. Enchanting objects. Placing blood traps.

Side/Secondary Effects

Exhaustion is common if too much blood is being used, and death is even possible. The user must be skilled enough to gauge how far they can go without endangering themselves.

Manifestation

As the blood is sacrificed, it is manipulated to the caster's will.

Source

The source of life, blood.