Eternano

Eternano (エーテルナノ Ēterunano) is the term coined to name particles of Magic. Eternano dwells inside all living organisms and throughout the atmosphere. Nobody knows when Magic began, or how Eternano originated. To utilize Magic, a Mage must use their (as the case may be) power. Eternano is the source of Magic Power for all Mages. Every Mage has a container inside their body that determines the limits of their Magic Power. If the case becomes empty, Eternano will come from the atmosphere and enters the Mage's body and after a while, their Magic Power is restored. However, recent studies have identified another part of the Mages' Magic container that isn't normally used, and contains their dormant power called Second Origin. If the power within this second container is released, then the Mage will receive an enormous boost in Magic Power.

Living organisms cannot live in areas of extremely concentrated Eternano, as it apparently has detrimental effects upon the structure of the body.