To activate the finisher, you need to scan the Wonder Ride Book to the Ankokuken Kurayami. You can scan the Wonder Ride Book multiple times too and use it to power up with other Wonder Ride Books. The Ankokuken Kurayami can also scan other Wonder Ride Books, including the Legend Rider Series ones. Lastly, the included Jaaku Dragon Wonder Ride Book can be used to the DX Seiken Swordriver (sold separately). The DX Ankokuken Kurayami & Jaken Caliburdriver cost 6,578 yen and is now available.