Why Are the Flames Immortal?

Once, in a time before, there lived a man with fire in the blood. And when his time had come, that fire turned to stardust and fell throughout the earth. These flames buried themselves deep within the humans, sinking down and blending into their very souls. So well-hidden were they that the humans barely knew of their existence... until they felt the heat in their children's children's blood. A rare thing, for one to be born who could feel the strength of these flames burning in their own blood. But once, twice, in a family strong with these flames, would come one who could go beyond simply feeling the heat. Every once in a great many times, one would be born who could harness that power. And thus magic, the immortal flames, live on in the blood of the Sorcerers.