5th Type Magic Aid Tube (5型魔法補助試験管, 5 Gata Mahō Hojo Shikenkan) is an aid tool in learning Wind Magic. A high concentration of 5th type Rukh are entrapped inside it. Even if the person using it doesn't know a single wind spell, the only thing they need to do is to listen to the rukh, to perform Wind Magic.
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The tube
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Listening to the Rukh