Kyou Kara Maou!

Maryoku (魔力) is the amount of demon power that Mazoku have to use majutsu (demon magic). Maryoku is an intrinsic characteristic of the soul. One cannot acquire more Maryoku by training or in any other way.

Mazoku must then make a pact with one of the elements so that they can use their magic. Humans use Houjutsu to fight the Mazoku.