Changes

Human [[soul]]s can get sent to Hell after making [[Deals and Pacts|deals]] with [[crossroads demon]]s or other demons with the authority to make deals such as [[Azazel]] and [[Lilith]]. [[Hellhound]]s capture then kill the person when their their time is up. Once in Hell, a soul will be tortured for centuries until the last vestiges of their humanity are burned away, creating new demons to continue the cycle of torture. The length of time it takes for a human to become a demon is unknown, as John Winchester spent a century being tortured, and was able to escape Hell in his human form. Like entry into Heaven, the criteria for a person being damned to Hell beyond selling one's soul is unknown. Human souls can remain in Hell for centuries before turning into demons. Souls that have escaped Hell, can appear as [[Hell Ghosts|skeletal apparitions]] that can manifest and retain their human appearance on earth.