Krystal was not your average Demon. She was different from the others, not because of her powers or her rage towards humans and everything else but because of her humanity. Demons weren't supposed to feel humanity in them, their souls were blackened and twisted from their time in Hell. They felt nothing but the need to destroy and twist other souls simply because they could. After spending a certain amount of time in Hell, the souls would forget about their humanity and their life from before. Everything would fade away like a dream and in its place would be a soul no longer pure and good but dark and destructive. And that's how Demons were made. Unfortunately for Krystal, she remembered her time as both human and Demon. Her human life had been nothing but pain and misery. Towards the end of what she considered her human life, she had met a newly turned Demon, humanity still there but slowly slipping.

The Demon had introduced her self as Meg in the beginning. After Meg had helped Krystal escape from her prison, she had stuck around the beaten, broken human. During the time they spent together, Meg explained who and what she was, where she came from and what Hell was like. Krystal had listened intently, fascinated with her stories. Krystal had questioned Meg's humanity at times. Meg had told her it was because she had been sent out to seal the rest of her soul by killing and torturing anyone she came across. Krystal pointed out in confusion that the Demon hadn't killed her. Not quite being a complete Demon yet, Meg told her it was because she thought Krystal didn't deserve it. After that, Meg stayed close to Krystal even going so far as to tell the girl her human name before she forgot it.

And when Krystal eventually went to Hell for killing her jailors and tormentors despite what they had done to her, Meg had continued to be there for her in her own special way. Not wanting her to turn completely, Meg and Krystal cast a spell they hoped would last. If Krystal were able to remember her humanity even in Hell then it meant she wouldn't be a full Demon. Of course there was a downside to the plan. Knowing they wouldn't be able to stop her from going to Hell or the eventual conversion to Demon, they used a small piece of her soul for the spell. The spell would protect that piece of soul no matter what, keeping it pure and good.

During their time in Hell, Meg completed her conversion, turning into a full Demon. Krystal spent her time being tortured by the Demons until eventually the rest of her soul that wasn't protected, turned dark. And that was how she became a Demon.