This ability allows you to fuel your spells directly from your health instead of from your mana. Blood magic is dangerous, though. Spells will drain more health than they would use mana and every time you cast a spell while Blood Magic is in effect, there's a chance that the penalty will grow. Once you have started using Blood Magic, you cannot stop until it wears off by itself or you die. Additional ranks increase the duration of each stage of the effect.
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