Sky

Sky (Romaji: Sukai; Kana: スカイ) is a Caster Magic which allows its user to generate and manipulate firmaments.

Description
Sky consists of the generation and manipulation of firmaments, celestial spheres which are both bigger on the inside than they are on the outside and capable of altering the appearance and properties of the roof and sky for those whom are within them.

For every cubic foot of volume that a firmament exhibits on the outside, the firmament will exhibit 20 cubic feet of volume on the inside. As an example, a firmament that exhibits a volume of 6 cubic feet on the outside will exhibit a volume of 120 cubic feet on the inside.

For the most part, the environment of a firmament's interior will be either identical to or reminiscent of the environment of the firmament's exterior. The sole exception is the sky of the firmament, for the sky of a firmament is able to be manipulated by the caster whom generated the firmament.

The sky of a firmament is able to exhibit the appearance and properties of any sky that the caster has enough magical power to emulate; as such, a firmament could exhibit the blue sky of a clear day on Earth or the ashen sky of the hottest day of Venus! As a result, Sky is one of the most absurdly powerful and extremely versatile magics in the world! However; in exchange for such power and versatility; Sky is costly in terms of magical power, difficult to cast without mishap or mistake, exhausting to the mind if maintained for an excessive amount of time, and strenuous to the body.

Trivia

 * Sky was inspired by Sun(shine), the Grace of Mael and later Escanor.