A person who can extract power directly from Ragnite without the use of alchemic machinery. Most humans cannot use mana except by utilizing a Hermes engine.
Before the Azure Revolution made Ragnite widely available, alchemy was seen less as a science than as a form of magic. Those who could "cast spells" were thus respected as divine beings or feared as sorcerous entities of superhuman origin.
Alchemists can implement effects based on the element of the harnessed Ragnite.