Dark Ring

Dark Rings are evil devices used by the Digimon Emperor to control digimon and make them his slaves. These devices are powered by his Dark Digivice, and its power is in turn spread by Control Spires. In order to free an enslaved digimon, the Dark Ring or a nearby Control Spire must be destroyed. They are not unlike Devimon's Black Gears and carry out a very similar purpose.



When he kidnapped Agumon and attempted to force him to digivolve into MetalGreymon, Digimon Emperor eventually realized that although the Dark Rings could control digimon up to the Champion level, but Ultimates could not be contained by them; Agumon continuously digivolved into SkullGreymon. He then created the Dark Spiral and was able to make Agumon digivolve into a virus-type MetalGreymon and control him with ease.

Much later on, it is revealed by Myotismon that the design for the Dark Rings and Dark Spirals were based off of Gatomon's tail ring. The details of this are unknown.