In addition, by leading in the DX Dragonic Knight or King Lion DaiSenki Wonder Ride Books (both sold separately), you can activate a unique special attack sound. Lastly, the item also plays with the DX Seiken Swordriver (sold separately). Once you lead in the Kaenken Rekka to the Booster and pull the trigger, a unique special attack sound will also play. This item cost 4,620 yen and is set for a December 5th release.