I want more detail on how it became an incarnation. So far.. we know Keith was created by the embodiment of Chaos, who would have control over that energy completely. But before that Hiro said it was unknown as to why the Chaos gathered and created him. And Rev and Gen came from imprints in the magic left over... along with [classified] yet to be revealed.
But how does one purposefully make an incarnation of just any energy with no spirit/no astral and no embodimental powers over the energy you're using? Life normally can't be created by a mage, unless it's through spiritual or artificial means.