Arkus

The planet Arkus is home to a robotic species.

3H Universe comics
Some time after the Dweller was reawakened and had left Cybertron, the Quintessons dumped him on the thriving world of Arkus. It did not take long for the Trans-Organic monstrosity to turn the planet into a desolate wasteland filled with little but corpses.

A couple of centuries later, the Dinobots were sent to Arkus by the Oracle to awaken a "sleeping giant". The Oracle claimed their mission would teach them to balance savagery and thought. That was a load of slag, as the Oracle was under control of the Quintessons, who needed to get the Dinobots off Cybertron and preferably killed.

On Arkus, Magmatron grew suspicious when all he and his crew found were corpses. He ordered the Dinobots back to the shuttle, but the group found their path blocked by a number of energy vampires. Those, the Dinobots could deal with, but their master was a different story. Rapticon and Airraptor perished in battle, while Striker simply "vaporized". Due to Magmatron's efforts, the rest of the Dinobots could reach the shuttle. When they returned to help their leader, both he and the Dweller were gone.

The AllSpark Almanac
Arkus was a neutral robotic planet in the Milky Way.