Star Ring Repair Shop

On Third Street of Rust Harbor Star, mechanic Chen Mo, who takes on shady repair jobs to pay off his debts, accepts a wrecked military mech. Embedded in its core chamber is a pulsating black crystal. This thing, known as the 'Constructor Core,' drags him into a shocking mystery spanning star gates. Beneath the lights of his repair shop lie the secrets of the entire galaxy. — Description from novelcodex.org