Ongekikou

Ongekikou Kaentsuzumi (音撃鼓・火炎鼓): Attached to the buckle, Hibiki presses this into the body of a large monster to form a large drum for his Ongeki Da finishers.
 * Ongekikou Bakuretsu Kaentsuzumi (音撃鼓・爆裂火炎鼓): An upgraded version of Hibiki's buckle. It's made so his Ongekibou Rekka can beat the highest pure sound, and require less beating.