Overdrive (lit. Pure Power Booster) is a type of "unique weapon" which was developed by Miki Chiharu. It is mainly used in order to enhance a Spirit's overall power and release their 'Drive Form' aside from their Spirit's Form and Inverse Form. It can only be used by a spirits who knows how to manifests their mana and power extremely well. Additionally, the 'Drive Form' of the Overdrive is technically stronger than a spirit's Inverse Form, instead of using Angels and Demon Kings, they gained the ability to produce power by themself.
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