Dark Crystals

Dark crystals are a substance that grows inside every Elemental. They are tiny, black crystals scattered around their bodies.

Physiology
Dark Crystals are crystals growing inside an Elemental's body, moving through their bloodstream. They are too tiny to be seen or felt.

The amount depends on the negative emotions someone lived through their life. The worse things they had happen to them or seen, the more Dark Crystals grow. Even after having them removed by a medical procedure, they will grow back.

Medically extracted Dark Crystals are sold as Dark Matter, an expensive material. It can be used for........

Dark Matter
Dark Crystals in mass form dark matter, a dark material that can be controlled by Dark Types that learned magic. Hundreds of years ago, dark types could even control dark crystals that were still inside the Elemental bodies, and they have been hunted and killed for it. Nowadays, no dark type can control anything but dark matter.

Trivia

 * Witches can learn to control dark crystals inside Elemental's bodies.
 * Dark matter can be bought in bulk from certified shops who ethically source them. Black market dark matter is a huge problem in Phoenie.