ZAIA Thousandriver

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The , or simply the Thousandriver, is the transformation device used by Kamen Rider Thouser. It also serves as the transformation device of Kamen Rider Zaia. The Thousandriver was produced by ZAIA Japan using the data of eight Progrisekeys and eight Zetsumerisekeys, and served as the culmination to Project Thouser. 
==Design==
The ZAIA Thousandriver consists of the following parts:
* - The right-hand slot used to insert Progrisekeys into the Driver. Learning is performed when a Progrisekey is inserted and the Key's is sent to the Fusion Reactor. Pushing a key within the slot will activate Thouser's Thousand Destruction finishing attack. If an alternate Progrisekey aside from Amazing Caucasus is exchanged and inserted without removing the Awaking Arsino Zetsumerisekey, the user can perform the Progrise finisher.
* - The left-hand slot used to insert Zetsumerisekeys into the Driver. Learning is performed when a Zetsumerisekey is inserted and the Key's is sent to the Fusion Reactor.
* - The central golden circular section. it is an irradiation device unit that produces Thouser's Infrast Tecter bodysuit and other equipment during via irradiation molding beams before being put on the wearer.
* - The two doors that open up during transformation. When closed, they cover the Thousand Equipper as a security mechanism. When a Progrisekey and a Zetsumerisekey has been inserted, it will open, activating the Fusion Reactor. Once opened, it acts as a reflector, improving the accuracy of the irradiation molding beams.
* - The Driver's reactor located within the main body. By performing a fusion reaction with the Progrisekey's Rider Model and the Zetsumerisekey's Lost Model, Perfect Rise is initiated to convert the synergies between them into a form that maximizes each Model's abilities, forming Kamen Rider Thouser.
==Functionality==
The ZAIA Thousandriver uses the Amazing Caucasus Progrisekey in conjunction with the Awaking Arsino Zetsumerisekey to transform the user into Kamen Rider Thouser, or the Carnotaurus and Triceratops Zetsumerisekeys to transform into Kamen Rider Zaia.
===Transformation===
To transform, the user inserts either their respective reversed key into the left-hand slot of the driver. Then, the user activates the other key, opens it, and inserts it into the right-hand slot, causing the face of the driver to open and reveal a projection of Thouser/Zaia's face. The respective Rider Model or Lost Models then manifest from the Driver, and circle the user before their horns interlock (with the Caucasus Beetle's Amazing Trident horns emitting pink light, the Arsinotherium's Awaking Lancer horns emitting sky blue light or the Carnotaurus and Triceratops both emitting red light) and their bodies fuse with them after the Infrast Tector materializes. Finally, the five horns are attached to the faceplate, generating the Thousand Eye Visor and finishing the transformation. To cancel the transformation, the user simply needs to eject both keys altogether.
===Finisher===
Pushing the Amazing Caucasus Progrisekey again after transformation initiates the . Doing the same with the Triceratops Zetsumerise Key initiates the CEO Destruction.
==Users (chronological order)==
User 	Kamen Rider 	Episode Obtained 	Description
Gai Amatsu 	Kamen Rider Thouser	This Is the Dawn of ZAIA 	Shortly after Metsuboujinrai.net was defeated for the first time, Gai made the ZAIA Thousandriver through unknown means. The driver was later destroyed by Ark-One. Another one was made after the events of the finale and was later taken by Lyon Arkland, which was later recovered.
Lyon Arkland	Kamen Rider Zaia 	Zero-One Others: Kamen Rider MetsubouJinrai	Lyon Arkland stole the belt from Gai Amatsu during the events of the V-Cinema. After Lyon's death, it was recovered by Gai Amatsu.
== Kamen Riders ==
*Kamen Rider Thouser (Reiwa The First Generation, Project Thouser, Zero-One Episodes 17-24, 25 (Flashback), 26-33, 35, 37-39, 43, Final Stage, REAL×TIME, Kamen Rider Genms -The Presidents-)
*Kamen Rider Zaia (Kamen Rider MetsubouJinrai)
KR01-Thouser.png|Kamen Rider Thouser
KR01-Zaia.png|Kamen Rider Zaia
==Notes==
*The Thousandriver is the second transformation belt in Kamen Rider Zero-One, and by extension the entire Reiwa era, to use the term "Driver".
**It would later be followed by the Ark Driver.
*It is the first Driver in the Reiwa era to require two devices to transform.
*The Thousandriver is the only driver not to have been repainted or receive a different faceplate, making it a new driver.
**The Thousandriver is also the only driver that requires two keys to initiate transformation in the series.
***In toys, however, the Awakening Arsino Zetsumerisekey doesn't have any function other than activating transformation standby sound of the Thousandriver. This is the same case with the Carnotaurus Zetsumerisekey.
*It is possible to authorize any Progrisekey with DX Thousandriver by placing the back side of a Progrisekey on top of the driver (near the speaker).
**Here is an example.
==Appearances==
==Navigation==
Category:Kamen Rider Zero-One
Category:Transformation Gear
Category:Arsenal (Zero-One)
Category:ZAIA Enterprise
Category:Arsenal (Outsiders)