Seitsuiken

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"*Kakusei!*"
―Seitsuiken activation
"*(Seitsuiken Name!) Bo-Dogon-Jaba-Byu-Doragon!*"
―Seitsuiken standby in Drago Hunter Frontier ZX
"*Hwah! (Song announcement)*"
―Seitsuiken summoning**Seitsuiken** (精追剣, Seitsuiken; Spirit Purifying Blade) is the ancient sword weapon crafted by The Ancient Being.

## List of the Seitsuikens

### Ancient Seitsuiken

The **Ancient Seitsuikens** are the first Seitsuiken sets that are from either the ancient time or modern past.

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"*Bō, Gon, Jababyu! Shuka-Nat-sume~!*"
―Shuka Natsume summoning announcement
"*Are You READY!! Ikari no Fukushū (Guraaah!), Namida no Sōshitsu! (Uraaa!) BUILD-EVO!! Arie! Hontō Arie!!*"
―Build-Evo transformation announcement
*Main article: Shuka-Natsume*

**Shuka-Natsume** is Shadowside Natsume's true form accessed only used by Samuel-no-Okami. Shuka-Natsume is also summoned by Samuel Nakaoka the Second after his training of punishment since he used his genjutsu.
Her Seitsuiken, also known as **The Blade of Shuka** is Shadowside Natsume Seitsuiken's true form.
Due to Shuka-Natsume is extremely powerful, she was quickly considered to be Transcendant Form, the beyond final form, although Baron's Red Master Form and Tsumiki's Mahou Shoujo Sin Form are not like final forms, but rather less powerful forms.
Afterwards, her Seitsuiken was turned gray and become inactive which means he's no longer summons Shadowside or Shuka Natsume when Shuka departs her Yokai World's Heaven. However, her Seitsuiken become active again because Samuel Nakaoka is still alive due to his Eternal Mangekyo Sharingan's useful genjutsu.

### Modern Seitsuiken

"*Bō, Gon, Jababyu! Shadow-side Natsume~!*"
―Shadowside Natsume summoning announcement

**Shadowside Natsume** is Natsume's Shadowside form that was summoned by Samuel Nakaoka the Second. She is debut appearance in PR the Series Movie: VS Shauna and her Seitsuiken was found in the deepest cave.
Her Seitsuiken, also known as **The Blade of Shadows** is mainly used by Samuel Nakaoka in either Zyuoh Eagle or Singular Rider S. Though Samuel Nakaoka summons Shadowside Natsume after event of VS Shauna, her personality is very cold towards him, briefly refusing his commands and even tries to kill her victims if she was insulted. She is also sadistic nature that she provokes Cooler to attack her.

### Power-up Seitsuiken

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"*Super Kakusei!!*"
―Activation announcement

"*Bo-Gon-Jaba-Byu! Dra-GON!!*"
―Standby announcement

"*Hwah!! O-Oooooh... A-aaaaaah!! Bo-Gon Ja-Byu...*"
―Standby Transformation announcement

"*Super Zyuohger!!*"
―Transformation announcement

**Super Zyuoh Henkeitsume** is Zyuoh Eagle/Shuka-Natsume's ultimate transformation device which allows to merge with Zyuoh Eagle and his two forms and Shuka-Natsume to form Super Zyuohger: Zyuoh Shuka. Super Zyuoh Henkeitsume first debut after Samuel Nakaoka's false death by converting his own body, S-Zyuoh form and his Evolution God form into a transformation device.

### Legend Seitsuiken

"*Eagle! (Zyuoh Changer turning sound) Zyu-oh Ea-gle~! (Zyuoh Changer Final transformation heavenly theme)*"
―Zyuoh Eagle transformation announcement
**Zyuoh Eagle Seitsuiken** is the Legend Seitsuiken.