Beast Hearts

Beast Hearts are heart-shaped crystal devices used by the Riders in *Kamen Rider Jiryuu*.

## Overview

Beast Hearts are powerful crystals that can be formed by a Fable Tail's magical energy, either voluntarily or forcefully. In the past, they were given to humans as a physical sign of the friendship between them. When used in a Shiro Driver, the Beast Hearts can temporarily grant a user access to the corresponding Fable Tail's magical powers and abilities. They also can power the weapons and equipment used by the Shiro Riders.

## Design

The Beast Hearts are composed of a material called **Merlin Quartz**, a crystalline structure that safely contains the Fable Tail's magic (or the Fable Tail itself in certain circumstances) from leaking out or being damaged. Merlin Quartz is colorless naturally, but the Fable Tail's magic changes it into a certain color. The Heart is imbued with an image called a **Depiction Sigil**, which specifies which Fable Tail's power is contained within the Heart. Below the Depiction Sigil is a round button called the **Awakening Button**, whose function is to stimulate the flow of magical power within the Beast Heart.

The unique Mega Beast Heart possessed by Uhoden is designed after a proper depiction of a human heart. It is composed of the **Rotation Cartilage** and **Stationary Cartilage**, a pair of round panels that form the shape of the Heart. The Depiction Sigils are placed upon a **Depiction Tapestry** sandwiched in between the panels. Each Depiction Sigil possesses its own rectangular Awakening Button.

The Hydra Beast Heart is shaped similarly to the other Beast Hearts, but each side of the Heart possesses sculpted depictions of the Draconic Brother's heads (Dragon on the left and Wyvern on the Right). In place of a Depiction Sigil is a sculpted depiction of Kamen Rider Jiryuu in his Dragon Tower form. The Awakening Button is also larger than all others, being shaped like a large heart.

## Functionality

The Beast Hearts contain the magical power of each Fable Tail. Fable Tails give up their humanoid bodies when producing a Beast Heart, transforming them into a more animalistic form. (This would be represented by them turning into CGI monsters). Fable Tails suffer no loss in power when producing a Beast Heart, and are capable of regaining their humanoid forms by reabsorbing their produced Beast Heart. The weakness is that producing more than one Beast Heart expels too much magic from the Fable Tail and creating too many is even fatal.

Pressing the Awakening Button stimulates the magical power contained inside, which is necessary for transformation as the contained power is normally kept dormant to prevent dissipation. The Fable Tail who spawned the Beast Heart also feels a sensation when the Awakening Button is pressed, so pressing the button can be used to summon the Fable Tail to aid the user should they not be present at the moment.

Because Beast Hearts contain the same magical essence that forms a Fable Tail's being, Fable Tails are capable of entering and exiting their respective Beast Heart at will. While inside, the Fable Tail can use the contained magic to heal injuries. Pressing the Awakening Button while a Fable Tail is inside the Beast Heart causes an even stronger sensation than normal, so pressing the button can be used to force a Fable Tail out of their Beast Heart.

In the rare occurrence that a Beast Heart is destroyed, the resulting effects will depend. If the Fable Tail is outside of the Beast Heart during its destruction, the released magic will simply be reabsorbed into the Fable Tail across any distance in the form of a colored mist. However, Fable Tails that are inside of their Beast Heart will be killed should the Heart be destroyed.

## List of Beast Hearts

These Beast Hearts are used by Kamen Rider Jiryuu.

*"Dragon! (deep dragon roar)"* (Activation Announcement)

*"The heart is filled with the courage to burn oppression! The forces of darkness shall fear the Dragon!"* (Secondary Activation Announcement)

*"(rock music) Moyasu Goka! Tatsu Dragon Tower! (flames crackling) Flame On."* (Transformation Announcement)

* **Dragon Beast Heart**: A red-colored Beast Heart that contains the power of the Dragon Fable Tail. It grants control over the element of fire. Jiryuu uses it in the Shiro Driver-Ishi to transform into his default Dragon Tower form. The Awakening Button is emblazoned with the kanji for fire.

*"Griffin! (eagle cry)"* (Activation announcement)

*"The heart is filled with the ambition to pursue its dreams! The forces of darkness can never overcome the Griffin!"* (Secondary Activation Announcement)

*"(string orchestral music) Arakuruu Arashi! Washi Griffin Tower! (strong wind whistling) Storm Front."* (Transformation Announcement)

* **Griffin Beast Heart**: A yellow-colored Beast Heart that contains the power of the Griffin Fable Tail. It grants the power of flight and control over the wind. Jiryuu uses it in the Shiro Driver-Ishi to transform into his Griffin Tower form. The Awakening Button is emblazoned with the kanji for wing.

*"Manticore! (lion roar)"* (Activation announcement)

*"The heart is filled with the overwhelming desire to protect the innocent! The forces of darkness shall make a delicious snack for the Manticore!"* (Secondary Activation Announcement)

* **Manticore Beast Heart**: An orange-colored Beast Heart that contains the power of the Manticore Fable Tail. It grants the power of superhuman strength and a deadly posion. Jiryuu uses it in the Shiro Driver-Ishi to transform into his Manticore Tower form. The Awakening Button is emblazoned with the kanji for combination.
* Wyvern Beast Heart
* Hydra Beast Heart

These Beast Hearts are used by Kamen Rider Uhoden.

*"Mermaid! (beautiful female singing)"* (Activation announcement)

*"The heart is filled with the feelings of love and affection! The forces of darkness shall not lay a hand on those protected by the Mermaid!"* (Secondary Activation announcement)

*"(Hawaiian-styled music) Kaisho Kaisui! Sakana Mermaid Tower! (waves crashing into the shore) High Tide."* (Transformation announcement)

* **Mermaid Beast Heart**: A cerulean blue-colored Beast Heart that contains the power of the Mermaid Fable Tail. It grants the power of hydrokinesis. Uhoden uses it in the Shiro Driver-Kai to transform into her default Mermaid Tower form. The Awakening Button is emblazoned with the kanji for water.

*"Fairy! (cheesy sparkling sounds)"* (Activation announcement)

*"The heart is filled with compassion for the sick and the injured! The forces of darkness can't harm those under the protection of a Fairy!"* (Secondary Activation announcement)

*"(harps and jungle drums) Iyana Miko! Cho Fairy Tower! (harps playing) First Aid."* (Transformation Announcement)

* **Fairy Beast Heart**: A pink-colored Beast Heart that contains the power of the Fairy Fable Tail. It grants the power to heal wounds and protect allies. Uhoden uses it in the Shiro Driver-Kai to transform into her Fairy Tower form. The Awakening Button is emblazoned with the kanji for life.

*"Unicorn! (galloping followed by a horse neighing)"* (Unicorn Activation announcement)

*"The heart is filled with hope that the future is bright for all! The forces of darkness will be purified by the magic of the Unicorn!"* (Unicorn Activation announcement in Pegasus Mode)

*"Pegasus! (wings flapping followed by a horse neighing)"* (Pegasus Activation announcement)

*"The heart is filled with the judgement of light and darkness! The forces of darkness will meet their demise under the hooves of the Pegasus!"* (Pegasus Activation announcement in Unicorn Mode)

* **Mega Beast Heart**: A special white-colored Beast Heart that contains the power of the Unicorn and Pegasus Fable Tails. Uhoden can use the Mega Beast Heart to access one of her two super forms: Unicorn Tower or Pegasus Tower. Unicorn's Awakening Button is emblazoned with the kanji for horn, while Pegasus' Awakening Button is emblazoned with the kanji for sky.

These Beast Hearts are used by Kamen Rider Horrur.

*"Werewolf! (wolf howling)"* (Activation announcement)

*"The heart is filled rage aimed at those who hurt the less fortunate! The forces of darkness will receive their punishment from the claws of the Werewolf!"* (Secondary Activation announcement)

*"(pipe organ music) Toero Kemono! Okami Werewolf Tower! (claw scratches and biting noises) Can't Run."* (Transformation Announcement)

* **Werewolf Beast Heart**: A purple-colored Beast Heart that contains the power of the Werewolf Fable Tail. It grants the powers of energy claw constructs and anger empowerment. Horrur uses it in the Shiro Driver-Tsuki to transform into his default Werewolf Tower form. The Awakening Button is emblazoned with the kanji for wolf.
* **Gill-Man Beast Heart**: A dark green Beast Heart that contains the power of the Gill-Man Fable Tail. It grants the power of electrokinesis. Horrur uses it in the Shiro Driver-Tsuki to transform into his Gill-Man Tower form. The Awakening Button is emblazoned with the kanji for thunder.
* **The Monster Beast Heart**: A grey Beast Heart that contains the power of the Monster Fable Tail. It grants superhuman strength and inhuman durability. Horrur uses it in the Shiro Driver-Tsuki to transform into his Monster Tower form. The Awakening Button is emblazoned with the kanji for power.
* **Vampire Beast Heart**: A crimson Beast Heart that contains the power of the Vampire Fable Tail. It grants the powers of energy draining and access to an alternative powered-up state that grants flight capabilities. Horrur uses it in the Shiro Driver-Tsuki to transform into his Vampire Tower form and its Berserk State. The Awakening Button is emblazoned with the kanji for moon.

These Beast Hearts are used by Kamen Rider Seburd.

* **Tengu Beast Heart**: A scarlet Beast Heart that contains the power of the Tengu Fable Tail.
* **Kappa Beast Heart**: A lime green Beast Heart that contains the power of the Kappa Fable Tail.
* **Kitsune Beast Heart**: A magenta Beast Heart that contains the power of the Kitsune Fable Tail.

These Beast Hearts are used by the Negative Elementals.

* **Salamander Beast Heart**: A dark orange Beast Heart that contains the power of the Salamander Fable Tail. It grants pyrokinesis.
* **Undine Beast Heart**: A navy blue Beast Heart that contains the power of the Undine Fable Tail. It grants hydrokinesis.
* **Gnome Beast Heart**: A brown Beast Heart that contains the power of the Gnome Fable Tail. It grants geokinesis.
* **Sylph Beast Heart**: A teal Beast Heart that contains the power of the Sylph Fable Tail. It grants aerokinesis.

These Beast Hearts would be exclusive to the Kamen Rider Jiryuu toyline. They should be considered non-canon.

* **Bishop Fish Beast Heart**: A midnight blue Beast Heart that contains the power of the Bishop Fish Fable Tail. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Bishop Fish Tower form.

*"Kuuga! (Arcle transformation sound)"* (Activation sound)

* **Kuuga Beast Heart**: A red Beast Heart that contains the power of Kamen Rider Kuuga. It would grant access to the Golden Power of Kuuga's Rising Forms. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Kuuga Tower form. The Awakening Button is emblazoned with Kuuga's symbol.

*"Agito! (Alter Ring standby sounds)"* (Activation sound)

* **Agito Beast Heart**: A yellow Beast Heart that contains the power of Kamen Rider Agito. It would grant access to power similar to a Seed of Agito. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Agito Tower form. The Awakening Button is emblazoned with Agito's symbol.
* Ryuki Beast Heart
* Faiz Beast Heart
* Blade Beast Heart

*"Hibiki! (Henshin Ongaku ringing sound)"* (Activation sound)

* **Hibiki Beast Heart**: A purple Beast Heart that contains the power of Kamen Rider Hibiki. It would grant access to Ongeki techniques. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Hibiki Tower form. The Awakening Button is emblazoned with Hibiki's symbol.
* Kabuto Beast Heart
* Den-O Beast Heart
* Kiva Beast Heart

*"Decade! (Ride Booker sound)"* (Activation sound)

* **Decade Beast Heart**: A magenta Beast Heart that contains the power of Kamen Rider Decade. It would grant control over Dimensional Walls to travel to different Rider Worlds. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Decade Tower form. The Awakening Button is emblazoned with Decade's symbol.
* Double Beast Heart

*"OOO! (OOO Scanner sound)"* (Activation sound)

* **OOO Beast Heart**: A yellow Beast Heart that contains the power of Kamen Rider OOO. It would grant access to the abilities of the Taka, Tora, and Batta Core Medals. If used in a Shiro Driver, it would presumably unlock access to the hypothetical OOO Tower form. The Awakening Button is emblazoned with OOO's infinity-like symbol.
* Fourze Beast Heart

*"Wizard! (Wizardriver swapping sides sound)"* (Activation sound)

* **Wizard Beast Heart**: A grey Beast Heart that contains the power of Kamen Rider Wizard. It would allow access to Wizard's various spells (like Connect, Extend, Big, etc.) and the ability to enter a Gate's Underworld. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Wizard Tower form. The Awakening Button is emblazoned with Wizard's Flame Ring symbol.
* Gaim Beast Heart
* Drive Beast Heart

*"Ghost! (Eyecon Driver loading sound)"* (Activation sound)

* **Ghost Beast Heart**: An orange Beast Heart that contains the power of Kamen Rider Ghost. It would allow the ability to see ghosts as well as levitation and intangibility. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Ghost Tower form. The Awakening Button is emblazoned with Ghost's eye symbol.
* Ex-Aid Beast Heart
* Build Beast Heart

*"Zi-O! (Ziku-Driver transformation sound)"* (Activation sound)

* **Zi-O Beast Heart**: A pink Beast Heart that contains the power of Kamen Rider Zi-O. It would allow the user to travel through time. If used in a Shiro Driver, it would presumably unlock access to the hypothetical Zi-O Tower form. The Awakening Button is emblazoned with the katakana for Rider.
* Element Beast Heart

## Trivia

* The design of the Beast Hearts was inspired by the Crystal Heart from *My Little Pony: Friendship is Magic*.
* The concept behind the Beast Heart's bears similarity to the Volsunga Saga from Norse mythology, where the monster Fafnir's heart is believed to be the source of its strength and power.