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The Kekkai Barrier is a 400 year old barrier created by the Onmyōji to protect their main house or human beings from yōkai's that tried to get in a town or in a castle etc. It uses the spiritual powers of an Onmyōji to create the barrier, if there are many Onmyōji gathered around and uses their spiritual powers the barrier will become powerful and makes it harder for a yōkai to get in. You must be in full concentration to make the barrier strong. Akifusa is the one known successfully destroying the barrier.