Presenting the Transformers Combiner Wars Ultra Magnus!This is the IDW/G1 continuity Ultra Magnus and not the Ultra Magnus who was robbed of the leadership of the Autobots by Hotrod (Rodimus Prime).
Which means that the Combiner Wars Ultra Magnus is the Duly Appointed Enforcer of the Tyrest Accord, and upholder of the Code of Interplanetary Conflict - or so he keeps saying.
He also hides a terrible secret: The real Ultra Magnus was a law-enforcer. He's dead. After he died Chief Justice Tyrest believed that the legendary law-enforcer had to continue on given what he symbolized. So he created and released an Ultra Magnus armor that was run by "loadbearers" - a small amount of tiny Autobots who had sparks strong enough to animate the armor.
Each time the Ultra Magnus pilot would receive fatal injuries, the armor would return to Tyrest and a new loadbearer would animate the armor. Because of this Ultra Magnus gained the reputation of being "unkillable" as he seemed to have the ability to bounce back from critical injuries.
Little did anybody know that four loadbearers had already died in the service of Tyrest. The current pilot of the Ultra Magnus armor is Minimus Ambus - a tiny Autobot who always dreamed of holding the line against the Decepticons in the Great War.