The Dark Fire

The Dark Fire is the source of all magical power, where all power was created. When a Caster's powers are removed, their powers return back to the Dark Fire.

History
In Beautiful Darkness, Sarafine removed Ridley's powers and made her mortal, they returned to the Dark Fire. Sarafine has been summoning power from the Dark Fire and the power of the Dark Fire was being channeled into the moon to call the Seventeenth Moon out of time. If Casters channel their collective energy back into the Dark Fire, it becomes exponentially more powerful like a supernatural atomic bomb and could do some serious damage. Lilum and Darkborns were also born from the Dark Fire.

Trivia

 * As stated by Abraham Ravenwood, Light Casters are afraid of the Dark Fire.
 * During funerals, the Supernatural's body is returned back to the Dark Fire.
 * A Caster's powers can be removed and returned back to the Dark Fire by another Caster.