I saw this very interesting theory on the Halo subreddit, /r/halo. Note that this doesn't belong to me, I am merely sharing it. Enjoy. [quote]I have a theory, one that I've had for a very long time. Once Halo 4 was released, everything just supported my theory. Ahead, you will read a theory that is very likely to be possible, and true. Unless you possibly want to spoil Halo CE-Halo 6, then don't read. You have been warned. Alright, now that I said that, I'm going to state my conclusion first, then I'm going to give the evidence, I'm not much of a writer, so bear with me. Master Chief is Bornsteller. There. Thats my conclusion. Master Chief has Bornstellar's geas. For those who don't know, Bornstellar is the main character in Cryptum, and also..... the Didact. But not the Halo 4 Didact, that Didact is called the Ur-Didact. Halo 5 and 6 will be the rivalry between the Didact and Chief, and it's all being set up by the Forerunner Books. So..... heres my evidence. In the Forerunner Trilogy, the Didact meets Bornstellar when he's really young, and they travel across the galaxy doing stuff that doesnt matter to my theory. What matters, is that near the end, the Master Builder sentences the Didact to be killed, and Bornstellar doesnt see him after, at all. Bornstellar, who was given a "brevet mutation" by the Didact, starts mutating into the Didact himself, gaining all his memories, attitude, everything. He becomes what we call, the Bornstellar Didact. But, this is only because everyone believes the Ur-Didact(Original Didact) is dead. Bornstellar takes his place. In Silentium, the Ur-Didact returns, as he was dumped on a flood infested installation. We assume the 2 Didacts work together to fight the Flood. After this, nobody knows which Didact did what... was it the Ur-Didact who activated the rings and died, and Bornstellar was the one who used the composer and eventually exiled on Requiem? Or vice versa? I say...... On Requiem and the Halo 4 terminals, that was the Ur-Didact, and the Didact on the Halo 3 terminals, the one who activated the Rings, was Bornstellar. In the Ur-Didact's leave, The Bornstellar Didact fell in love with the Librarian, explaining his words to her in the terminals. Thats what I've established, and now that we have that done, lets explain the Geas.... Chakas had the Lord of Admiral's Geas, right? Well, thats just right. A lot of humans have geas, a command imposed on them, and some humans have personality imprints in them, which came from other humans or forerunners. Hell, the Librarian even programmed Geas' in many humans, and so their children's children's children eventually fulfill that command. Thats exactly what the Librarian did..... but I don't know how, yet, but Spartan Ops Episode 4 suggests she survived on Requiem, so she could've done it after. Somehow, after Bornstellar activated the Halo's, she took his imprint, and implanted it into one human, along with a geas. The geas/imprint was passed down from human to human, generation to generation for over 100,000 thousand years. That imprint/geas..... was passed to Chief. He has no idea. The Librarian says that he is meant to defeat the Didact, and everything has been planned, meaning that she could've set up thousands, maybe millions of geas' in the humans, each meant to help set up the Spartans, and the Chief. This is the quote, "Reclaimer, when I indexed mankind for repopulation, I hid seeds from the Didact. Seeds which would lead to an eventuality. Your physical evolution. Your combat skin. Even your ancilla, Cortana. You are the culmination of a thousand lifetimes of planning." The command imposed on the Chief is to defeat the Didact, and Bornstellar's imprint is on him. The Geas/imprint thing is more fully explained in the Forerunner Trilogy, mostly Primordium. Now how do I know he's Bornstellar? Well, lets look at the games.... Remember when 343 Guilty Spark started being Chief's enemy in Halo: CE? 343 says "Last time, you asked me, if it was my choice, would I do it? Having had considerable time to ponder your query, my answer has not changed. There is no choice. We must activate the ring." The Didact is the one who activated the Rings. Sure, Spark was rampant, but why else would he refer to the Chief as if he is the one activated the rings? This quote also indicates that Chakas/Spark was present when Didact activated the rings. Another quote, immediately after Cortana told Chief that Halo is a weapon, "More or less. Technically, this installation's pulse has a maximum effective radius of twenty-five thousand light years. But, once the others follow suit, this galaxy will be quite devoid of life, or at least any life with sufficient biomass to sustain the Flood. But you already knew that... I mean, how couldn't you?" How would Chief already know that? Only one reason. Bornstellar did. BWAAAM. So far, as evidence, is 343 Guilty Spark's words, the Librarians words, and so on. In H3 even, 343 said Chief was Forerunner. Also... Bornstellar can't just exist purely for the fact of making an excuse for the Ur-Didact surviving. From one view, 343 created Bornstellar because the Didact died firing the rings, yet they wanted Chief to fight the Didact. So they could've created him just to allow the Didacts survival. It can't be that simple. Bornstellar is the Protagonist for a reason. Its because he will eventually become the Chief. I have a feeling that over time...... I'll discover that I am right. The Didact will find out, and he will start hating Chief for it, if he doesnt already. The Reclaimer trilogy is the fight between the two Didact's. John 117 has the imprint of Bornstellar Makes Eternal Lasting in him. And he will find out soon. Thats my theory. Thoughts?[/quote] Here's the [url=http://www.reddit.com/r/halo/comments/13z7kt/who_master_chief_is_campaign_spoilers/]link[/url] to the original post so you can upvote this genius.