Project Build

Project Build was a top secret research project developed by Takumi Katsuragi. He developed this project while studying Nebula Gas, believing he could harness it for some kind of use. Sento obtained the hidden plans after talking with Takumi's mother and engaging in a battle with Night Rouge and Blood Stalk.

Faust wants to continue the project, which is revealed to be weaponized Rider Systems for the sinister use of warfare. Who they intend to use it on is unknown at this time.