Mythics are one of the two primary types of manifestation— the other being spirits. As a primary manifestation, mythics are autonomous creatures that are entirely composed of magical energy. They are conduits for magic, and have the unique ability to create a physical form for themselves at will. This separates them from spirits, who are not powerful enough to manifest physically.
Mythics are born from magical fields, meaning that they interface with humanity's collective unconscious. They often take forms that are familiar to humans through fiction and folklore, giving them the title of mythical creatures— mythics for short. They have an enormous range of power levels and abilities, ranging from little tricksters to the most powerful of dragons.
Mythics are much, much rarer than spirits, and they cannot reproduce naturally. They rely on their extremely long lifespans and hibernation cycles to survive on their own; when it does come time for them to pass their lineage on, they will choose someone with a low magical potential to become their heir— and inherit their powers for many generations to come.