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Description
The original artwork was made by
Go check him out! And feel free to commission him! This was uploaded with his permission.

This is another fanmade form for Kamen Rider Build and the counterpart to PhoenixPhoenixform. Build RoboRobo form. This form is attained using the Hazard Trigger along with the FullFull PhoenixRobo bottle in the build driver while in Robot mode.

"Robo and Robo! Build up! Are you ready? Overflow! (classic robotic mixed sound) Kiken no Kuroi Machine! RoboRobo! Yabei! Dekai!"
―Transformation announcement

kiken no kuroi machine = dangerous black machine

In this form, Build can summon four small robots that resemble the Robot fullbottle’s icon to attack his enemies. He also gains electrokinesis, can absorb electricity from surrounding machines to boost his stats or electric attacks, and he can manipulate machinery.

This form’s finishing move is the RoboRobo finish. Build zaps the enemy with electricity, then he punches them with an energy projection of the Demolition One.

Description
The original artwork was made by
Go check him out! And feel free to commission him! This was uploaded with his permission.

This is another fanmade form for Kamen Rider Build and the counterpart to PhoenixPhoenixform. Build RoboRobo form. This form is attained using the Hazard Trigger along with the FullFull PhoenixRobo bottle in the build driver while in Robot mode.

"Robo and Robo! Build up! Are you ready? Overflow! (classic robotic mixed sound) Kiken no Kuroi Machine! RoboRobo! Yabei! Dekai!"
―Transformation announcement

kiken no kuroi machine = dangerous black machine

In this form, Build can summon four small robots that resemble the Robot fullbottle’s icon to attack his enemies. He also gains electrokinesis, can absorb electricity from surrounding machines to boost his stats or electric attacks, and he can manipulate machinery.

This form’s finishing move is the RoboRobo finish. Build zaps the enemy with electricity, then he punches them with an energy projection of the Demolition One.