Though he may be considered an average Magus at face value, he is highly skilled in the creation of Bounded Fields. He carries a special Bounded Field that is divided into three layers, and absolutely anything that steps within range of the outer field is automatically frozen in place. It is mobile, something out of the ordinary since Bounded Fields are usually impossible to move, and Araya typically uses it as a weapon. Not only that, but the building that serves as his lair has become so much a part of him that it is almost like a Reality Marble, cementing Souren as an extremely powerful Magus.
His origin is stillness, as seen by his obstinate pursuit for the Akasha and the properties of his boundary fields.
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Related manga:Kara no Kyoukai: The Garden of Sinners Novel, 1998