As you know, Cybuster has lost the power of Cyphis, the spirit of wind from LA GIAS. So he's using a Ritual Converter created by Shu, to harness the negative energy of the boundary space as a power source. So Cybuster must be cleansed of those regularly. If not, bad things could happen to Cybuster and/or Masaki. Masaki's prana intake and the Cybuster's attribute might turn negative.

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http://amara.org/v/V6yZ/