Muta-Gaath Nebula

The Muta-Gaath Nebula is a volatile nebula that serves as a good hiding place.

IDW Generation 1 continuity
In order to stay out of the war between the Autobots and Decepticons, Omega Supreme sealed himself away in an artificial asteroid inside the Muta-Gaath Nebula. Optimus Prime tracked him down in the Ark-32, looking for answers about Nova Prime, but was unwittingly followed by the "Monstructor Six", who wanted revenge on Omega. The two Autobots were forced to leave the asteroid and make their way onto a comet passing through the nebula, where Optimus Prime defeated Monstructor.