Magic in Nophra is intended to be very flexible. There are not really any limitations as to what can and cannot be achieved with magic. The magic system is based on 6 elements, but their sub-types and combination potential are infinite.
Mystic Crystali are creatures that are very closely linked to Nophra’s core, which constantly radiates energy. This energy is continually absorbed by them, and radiated out as a mist. It is their life force, and the reason they don't have to eat to regain energy and heal. This process is done completely involuntarily, similar to breathing. The mist they exude is a visual representation of this.
Being able to take in more energy at will to expel it as a 'spell' is a skill that one can be born with to a certain extent, or it can be further honed with study and training.
Common Crystali are Crystali that were born lacking magic channels and crystals. Without the ability to take in more magic from Nophra's core, they cannot use any spells and must sustain themselves with food and water instead of being fueled by magic. Although they lack magical abilities, they are still born with an element that can be determined visually because of the color of their eyes and claws.