Blood is a body fluid and one of the three parts of a living being, alongside bones and nerves.
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Blood is found and produced in the bodies of nearly all all living beings.
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Blood is rich in concentrated Anima, enough so that it can act as a direct source of physical, highly concentrated Anima. The downsides is that the Anima will dissipate within seconds after the blood leaves the body, with no way to replenish it after.