The 'O-F-531' Forge was developed by Osiris Construction as a fabrication Mech that could rapidly construct and repair structures within the field, whilst also defending the area from attack. They were purchased en-masse by Herrsch Manufacturing, and used effectively to prevent the inner tier of their home arco in the Verdant Crescent from being breached by starving citizens during the great food riots. This proved successful, and Osiris soon rolled them out to other corporate arcos to operate in a similar capacity.