Crystals are a energy absorbing material that allows a soul to enter in to it. Its a high valuable limited natural resource. When properly attached to a Body (Khet), a soul that has entered the crystal can fully control the body.

Different crystals range from price, value and durability. Here is a list of crystals durability going from the best to the worst:

1. Clear Quartz
2. Black Tourmaline
3. Labradorite
4. Amethyst
5. Citrine

Synthetic crystals

Since there is only a limited supply of the crystal, there has been many attempts to create them synthetically. The has been a few successful attempts, but the none of the synthetic ones were as good as the real ones.

Synthetic crystal are often soled on black markets as a scam. For example someone can be selling crystal that are presented as real clear quartz crystal but they are synthetically made and have much worse quality.