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Kurikara-ken it is a magic that borrow its power from the sword of Acala. The symbol of magic that can annihilate magic. When face with modern magic the sword will activate eidos and become a kind of counter magic to destroy overwritten magic sequence.
Kurikara-ken is consider a very high level magic because its very difficult to maintain in nature, since the magicians themselves would be disabled in order to maintain the magic.[1]