A Bounded Field (結界, Kekkai?) is a topographic type of Magecraft that consists in knitting a network of magical energy and spreading it on base area, such as a piece of land or a building, to create a mystic boundary line that separates the inside from the outside. By definition, it should not be possible to move them once they are set. Those of Souren Araya are an exception. The most powerful type of Bounded Field makes the space itself act as a boundary line and it is on a level close to Magic.