Cross-Z Magma Knuckle

The Transformation Dragon Fist Cross-Z Magma Knuckle (変身龍拳クローズマグマナックル) is a device used by Kamen Rider Cross-Z to transform into Kamen Rider Cross-Z Magma. Similarly to the Cross-Z Dragon, the Magma Knuckle is inserted into the Build Driver, loaded with its own Fullbottle (the Dragon Magma Fullbottle), to transform into a unique form separate from the Build Driver's standard half-changes.

History
After the Dragon Sclashjelly got covered in ashes from Blood Stark's attack, it soon reacted to Ryuga's emotions, and transformed into the Dragon Magma Fullbottle. Seeing this, Sento Kiryu created the Cross-Z Magma Knuckle as a power-up item, and weapon as the Fullbottle was too dangerous to be used in the Build Driver alone. Originally, Sento was planning on using it himself before giving it to Ryuga, who first thought it was useless before quickly reconsidering.

Design
The Cross-Z Magma Knuckle is composed of the following parts:
 * The CZM Volcanic Charger (CZMボルケニックチャージャー) is a special reaction blast furnace mounted on the Cross-Z Magma Knuckle. At the time of transformation, in addition to converting the ingredients of Dragon Magma Full Bottle into the equipment's Variable Magma (ヴァリアブルマグマ), it also has the role of generating luminescent energy for transformation and charge attacks. In addition, it can heat the captured trans gel solid at ultra-high temperature and increase its component quantity up to 4 times.
 * The Drag Burn Knuckler (ドラグバーンナックラー) is a blow and destruction unit attached to the Cross-Z Magma Knuckle. The Dragon Sclashjelly ingredients are melted in the parts that will be the striking face, and it can take in the heat of the surroundings to raise the power of the attack. When unleashing a charge attack, light energy is emitted from four ducts.
 * The Dragonic Igniter (ドラゴニックイグナイター) is a button used when activating a charge attack. By pushing the button, the CZM Volcanic Charger is activated, and rapid generation and compression of the light emission energy is executed. Luminous energy is emitted from the duct of the striking face at the same time as releasing the button, causing a large explosion with the impact of the attack. If a Fullbottle is loaded to the Fullbottle Slot, a special charge attack with its characteristics can be made, powerful enough to disable an enemy with a single strike.
 * The Fullbottle Slot (フルボトルスロット) is a slot when a Fullbottle is inserted. It has the role of activating the Transgel Solid (トランスゲルソリッド) in the loaded bottle with a special pulse and taking it inside.
 * The CZM Knuckle Transcer (CZMナックルトランサー) is a transformation button to use when transforming. After loading the Dragon Magma Fullbottle in the slot, lifting the grip while pressing the button activates the transformation system.
 * The Magma Bray Grip (マグマブレイグリップ) is the grip part of the knuckle. The motion detection system is carried and optimizes the behavior at the time of attack by recording and analyzing the behavior of the enemy and the habit of the user.
 * The CZM Knuckle Connector (CZMナックルコネクタ) is a connection terminal of the Cross-Z Magma Knuckle to use for the transformation. At the same time as the Cross-Z Magma Knuckle is loaded in the Build Driver, the Drag Burn Knuckler splits open, and the driver's function expansion is executed. After that, it forms a special ladle, the Magma Ride Builder (マグマライドビルダー) which is directly connected to the CZM Volcanic Charger, and it pours the Variable Magma from above the user. The Variable Magma reacts to special pulses emitted by the driver and changes to suit and armor.

Transformation
The user inserts the Dragon Magma Fullbottle into the Fullbottle Slot on the knuckle, the Magma Bray Grip is folded to the top when the CZM Knuckle Transcer is pressed, and inserts the knuckle into the Build Driver (As the CZM Knuckle Connector is inserted to the Twin Fullbottle Slots), causing the Drag Burn Knuckler to split down its middle, exposing the inserted Fullbottle. After cranking the Vortex Lever, the Magma Ride Builder forms and submerges the user in Variable Magma, forming 8 large serpentine dragon heads which harden to solid rock as they rises, before the Magma Ride Builder breaks the hardened construct, revealing the user clad in Cross-Z Magma suit & armor to complete the transformation process.

Weapon
Cross-Z can use the Magma Knuckle by itself as a knuckleduster weapon. In this mode, pressing the Dragonic Igniter without a fullbottle inserted will boost the weapon's power and enable it to unleash a charged attack.

Build Driver
After cranking the Vortex Lever, Cross-Z Magma performs the Volcanic Attack (ボルケニックアタック): Cross-Z Magma launches upward, summoning several serpentine dragon-constructs of Variable Magma, which are then sent flying at the target, quickly followed by a flying kick with an explosion of the same constructs at the point of impact.

Weapon
By plugging a Fullbottle into the top of the Magma Knuckle before pressing the Dragonic Igniter, Cross-Z can access the Volcanic Knuckle (ボルケニックナックル) attack, and empower the punches he delivers with it.
 * Taka: The Cross-Z Magma Knuckle projects orange energy hawk wings as Cross-Z uppercuts the enemy.
 * Dragon: The Cross-Z Magma Knuckle gives off dark blue energy shock waves upon impact.

Portrayal
The Cross-Z Magma Knuckle is voiced by Norio Wakamoto (若本 規夫), who previously voiced Rey Kivat and Arc Kivat in Kamen Rider Kiva: King of the Castle in the Demon World, and the Sclash Driver.

Appearances

 * Icon-build.png Kamen Rider Build
 * Episode 30: The Truth of the Pandora Box
 * Episode 31: Surging Magma!
 * Episode 32: Programmed Tragedy