Holder of Cybertron Part II
Then you will find yourself at the Autobot and Decepticon doors again. Knock on the Autobot door and say, "I have some energon for you", even though the energon is really for yourself. The Autobot door will open automatically, and Optimus Prime's corpse will be there. At this point, THROW THE ENERGON CUBE OUT THE AUTOBOT DOOR! Then, go up to Optimus's corpse and ask, "Why do you Autobots die so easily?"
Then, looking ONLY AT OPTIMUS'S EYES, Optimus's ghost will ask you why you asked that question. If you answer at this point, he'll GET UP AND TURN YOU INTO A SLAG HEAP! If you don't answer, he'll say, "One day an Autobot will rise from our ranks and use the power of the Matrix to light our darkest hour." At that point, grab a blaster (which should be next to you) and shoot his face. Then, grab the Matrix of Leadership and RE-CONQUER CYBERTRON FOR THE DECEPTICONS!!