Sengoku Driver

"Lock On!"

- Activation announcement

The Sengoku Driver (戦極（センゴク）ドライバー) is the transformation belt for Kamen Riders Gaim (who found it by accident), Baron (given the Driver by Sid), Ryugen (who used his status to convince Sid into "leaving behind" a Driver), Zangetsu, Gridon, Kurokage, Bravo, and Bujin Gaim.

To transform, the user opens the lock on the Lockseed, then attaches it onto the Drive Bay (ドライブベイ). The Rider then closes the lock to secure it onto the Lock On Arm (ロックオンアーム) and presses the Cutting Blade (カッティングブレード) knife down, which cuts open the Lockseed itself.

The Driver announces the Arms granted by the Lockseed, then a giant mechanical piece of fruit corresponding to the Lockseed used appears from a dimensional opening to the Helheim Forest above the user, and falls on top of their head. Once on the user, the fruit forms the helmet, materializes the suit, and the fruit disassembles to form the chestplate and pauldrons. If the Rider is already in the Helheim Forest, the fruit would just materialise above the Rider from energy in the same color as the Arms armor is in.

Even though all the Riders use a Sengoku Driver which share the same voice, they each have a unique Rider Indicator (ライダーインジケーター) plate on the wearer's left hand side. Each Indicator has different voice tones, as well as different phrases for each Lockseed being used. Each Sengoku Driver shown originally has a blank plate signifying that it is without a user; this is due to the fact that Sengoku Drivers are designed to synch with the first person that uses them, allowing only that individual to transform from thereon. However, a Yggdrasil Corporation employee was shown wearing a blank Driver, but the significance of this is unclear.

Moreover, the Sengoku Driver can be combined with the Genesis Driver. This can be done by replacing the Rider Indicator with the Genesis Driver's Driver Bay with the Energy Lockseed. Currently, it's purposes is still unknown but surely it will power up the Rider.

When the Cutting Blade is pressed down between one and three times, a Rider can activate a certain ability:
 * Once: The Squash (スカッシュ) function initiates the Rider's Rider Kick or powers up the Rider form's primary weapon for a finisher.
 * Twice: Au Lait (オレ) function gives extra power to the Squash function.
 * Thrice: The Sparkling (スパーキング) function converts the user's armor into its fruit form, which can be used as a shield before it reforms back into armor. Gaim's Orange Arms has the potential to rotate at high speeds when using this function, making any attack thrown at it glance off at an awkward angle, leaving the attacker wide open for a counterattack.

Portrayal
The voice of the Sengoku Driver and Lockseeds is provided by Hōchū Ōtsuka (大塚 芳忠), who is also the narrator of Gaim as well as previously voicing the Imagin Deneb in Kamen Rider Den-O.