Toaru Kishiou ga Furi Orosu Kanzen Chouaku no Hitotachi.

King of Arthur Wonder Ride Book (­у°ЄЦўьµьпуАьй¤ЙЦГЇ Kingu Obu s
Wand
Raido Bukku) can be used by Kamen Rider Saber to access his Dragon Arthur form. It is based on King Arthur. The text on the left side of the henshin page roughly translates to "The great knight king joins with the sacred sword and dwells within you." The book's name is shortened to "Arthur Mh" in the Swordriver's announcements.

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https://www.deviantart.com/markolios/art/King-Of-Arthur-862895556