Praxus-Delta

Praxus-Delta was the location of a notable battle during the war between the evil Autobots and heroic Decepticons on Cybertron. It probably has something to do with Praxus.

Shattered Glass
During the battle at Praxus-Delta, Optimus Prime hired Rodimus's band of mercenaries, the Wreckers, to fight on the Autobots' side. Unfortunately, every single Wrecker except Rodimus ended up getting killed by the Decepticons. Rodimus continued fighting to honor his contract, helping the Autobots escape without losing any other soldiers. This impressed Prime so much that he offered Rodimus a place with the Autobots and the Seekers, and Rodimus accepted.