Mana

Avrille using his magic to create mana crystals.

Mana (마력, literally 'magic force/power') is a form of energy and a driving force in this world.

Magicians need mana to perform their magic and especially crystallized mana is said to be used in everyday life by citizens of Aiud kingdom, as mana supplementation and amplification by magicians, and as a form of currency .

Thus, the skill of 'creating' mana crystals, the magic of the Edirne royal family, is highly respected and needed.

Fairies are beings that naturally hold a high amount of mana and even at times emit it unconsciously, in contrast to humans who strive to attain more mana to supplement their limited innate amount.