|Also Known As||Ki|
|Manga Debut||Night 1|
|Anime Debut||Episode 1|
Magoi (魔力（マゴイ）, Magoi) is the energy created from Rukh. Magoi is pure power. Concentrating Magoi and firing it is not that powerful and can only be used to give slight injuries. All living beings have Magoi inside their bodies, but only certain people with certain objects can call forth this power. Metal Vessels, Household Vessels, Magic Tools and Magicians all use Magoi to use Magic. If a person uses too much Magoi, it can leave them extremely exhausted or worse, makes them bleed out their eyes and ears until they collapse.
There are various ways to restore Magoi, of which include resting and eating to restore one's own physical strength. Magoi that has been stored inside a Djinn Metal Vessel can be restored by keeping it close to oneself for a few hours after restoring one's physical strength.
There is a another way of recharging the Djinn Metal Vessel Magoi: by using the existing elements in nature as power. The element needed must be the same as the ability of the Djinn, and can only be used for one attack.
Because the person is using one's very life itself, excess use of Magoi or if their bodies lack the ability to hold the Magoi can lead to a number of problems, even if you are a Magi. Some problems seen are:
- Straining of the body
- Bleeding from the eyes and mouth
- Can lead to a coma
- Shortens one's lifespan