Repair Units are small, quadrupedal mechanical organisms created by other organisms to repair, construct, and deconstruct other structures. They are small, and quite physically weak. They also lack offensive capabilities, being armed with a nanodeconstructor and nanoconstructor. Although they can use their legs to defend themselves.
They are usually mass produced, as they are quite clumsy and often damage themselves. They can navigate three dimensionally, being able to climb on walls, ceilings, and floors.