Robotnik soon returned, having made a deal with the Drakons, and was able to control a Mobius Ring (summoning it wherever he wished) by means of a device on his glove. He used this to travel from the Drakon homeworld to Mobius and back again, and Sonic was also transported back to Mobius (having won his trial by combat) by means of a Mobius Ring. Emperor Ko-Dorr also used a Mobius Ring to transport himself and his Sentinels to Mobius.