Powermaster Armor

The Powermaster Armor is a suit of powered armor worn by Optimus Prime in the scrumblebee comic.  Beast Planet/Shockwave's Revenge Arcs 

For all his appearances in these arcs, Optimus wears the Powermaster Armor.

 The Galvatron Crisis Arc 

When Optimus goes to investigate the Decepticon mercenaries on Chaar, he wears the armor. When he starts to fight Galvatron, the armor is damaged by a cannon blast from Galvatron, and he takes it off. After the fight, he takes the damaged armor to be repaired by Hoist, where it remains for the rest of the arc, being fully repaired by the time Ultra Magnus rejoins the other Autobots on the mobile base.