A former Buddhist monk who has lived for around 300 years and a previous acquaintance of Tōko from the Sorcerer's Association, also known as the Mage's Association) in London. Though he may be considered an average Mage at face value, he is highly skilled in the creation of Bounded Fields. He carries a special six-layered Bounded Field named Rokudou Kyoukai that is capable of preventing the movement of any thing within it. 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 Mage. He is the driving force behind the actions of the other antagonists through pressing them to awaken their innate abilities. His Origin is "stillness".