Every living creature on Dracca and even unliving things can be related to one of the eight basic elements: Air, Crystal, Water, Electricity, Fire, Light, Plant and Ground. Only dragons and related species can actually master this element.
A lot of crystals can be found on Dracca, mainly coming from the collision with Vherra. The crystal particles fell down during the next millions years. Hence, the crystals are often to be found on the surface instead of being deeply underground.