A google doc where I rewrite Halo 5. Lemme copy/paste some of it to show you that it is indeed a doc.
PART ONE
BT MISSION o1 - BLUE EMBERS
Blue Team was on a mission to recover or scuttle the Argent Moon. Master Chief still had Cortana’s AI chip stuck in his head whenever on missions, never wanting to feel like she was fully gone. Well, it turns out a small fragment left behind from her rampancy splitting herself apart into fractal copies of herself had managed to restore itself enough to access certain files and systems within the AI chip. Thus, this small piece of Cortana learned about something that she had forgotten and managed to contact John and the rest of Blue Team via surfacing from her AI chip and struggling to speak through their comms systems.
Cortana reveals that she is still alive, somewhat, but she cannot remain active for long (similar to how GLaDOS in Portal 2 wasn’t able to do much as a potato battery). She manages to let out that she knows how to truly restore herself and cure her rampancy for good.
BT GUNS DOWN MISSION - WHEN I MAKE A PROMISE…
Blue Team finishes their mission and returns to the UNSC Infinity. Fragment Cortana is jacked into a private server they managed to disconnect from the main systems in order to privately talk to Cortana. With better hardware, she is able to remain stable enough to reveal what needs to be done in order to restore herself.
Blue Team’s mission throughout the game is to locate and save Dr. Halsey from Jul 'Mdama, in order to get a DNA sample and a fresh brain-scan of Catherine for reference as a base for her AI to flourish within. Another thing they have to locate is the means of reactivating the Ark Portal on Earth. Doing so would allow them to return to The Ark and locate Mendicant Bias, a Forerunner AI that had betrayed The Forerunners for the Flood eons ago. He was actually the reason you ended up in Requiem since in Halo 3, he redirected your slip-space jump to have you delivered to what he believed to be an enlightened Didact to prove that he was no longer corrupt and rampant. Cortana believes that Mendicant Bias holds the answer to curing her condition since he bounced back.
Roland has actually been listening in the whole time and has not alerted the UNSC Infinity, and even provides them with a means of escaping; knowing there was no way that anyone would sanction Chief to do such a mission; given the risks posed. But Roland wants a cure to Rampancy, a condition he would suffer from eventually and he knows that if anyone out there could make such a mission successful, it would be John-S117. So, John goes AWOL in a Prowler docked in the UNSC Infinity. The mission ends with Blue Team assembling on Reach to meet at “the spot with their mark” and discuss as to whether or not they are doing this.
And this is where the story shifts to Jameson Locke’s perspective.
FO MISSION o2 - THE HUNT BEGINS
SIDENOTE
Originally, Fireteam Osiris was going to be made up of Locke, Vale, Tanaka, and Gabriel Thorne from Spartan Ops. Thorne was likely to be in the story because of Jul’s involvement and his experience with Jul himself. But sadly, Brian Reed rewrote the story to remove Thorne. This was because Spartan Ops was not well received, and he decided to do the sin of writing that is killing off a major antagonist that fans like at the beginning of the next arc to quickly rip in a new villain character. At least we got Edward Buck. But I propose that Fireteam Osiris be slightly different.
Given the mission that they are about to embark on, and the fact that Roland had to feed ONI something to not make him seem part of their conspiracy they made; he informed them of what Master Chief was planning, albeit leaving out the part with Cortana and just going out to rescue Dr. Halsey; claiming to not know how Blue Team got intel on her existence and last approximated location. So, ONI puts Jameson Locke on the mission and he assembles a specialized team. Olympia Vale is there because she is a Sangheilian specialist of culture and linguistics, Gabriel Thorne is on the team because of his past experience with Jul and Dr. Halsey, and Edward Buck is part of the team due to a recommendation by Veronica Dare on how reliable and dedicated he can be to his mission and the team; citing the events of Halo 3 ODST as an example of his character. Holly Tanaka is relegated to join Fireteam Majestic in Thorne’s stead.
Osiris begins the Hunt for the Master Chief, their primary lead being the last known location of Jul 'Mdama. This will lead to an encounter where Blue Team and Osiris first meet. Jul escapes with Catherine thanks to the meddling of Fireteam Osiris. And then Osiris gets their dignity smashed as Blue Team bests them in combat and then flees right as a massive Forerunner device erupts from the ground; interrupting their fight by creating a canyon between the two groups. A Guardian, but they don’t know that yet. Blue Team escapes as Osiris flees through the falling rubble and contends with Covenant forces.
EDIT -
As you can see, this is a google doc as I could in no way write all of this in two minutes.
It is a 23 chapter story summary of my attempt to restore the original story Halo 5 had before Brian Reed rewrote the story to be his fanfiction.
And with the added bonus of me trying to lead the final act into the opening circumstances of Halo Wars 2.