Editing Halo 5: Guardians

Aboard ''Infinity'', Halsey reveals that Cortana has somehow gained access to the [[Domain]], a galaxy-spanning repository of Forerunner knowledge. Worried that she is manipulating the Master Chief, Osiris is sent after Blue Team with orders to bring them back, hoping to neutralize them with [[armor restraint]]s. Arriving at Meridian, they descend the Meridian [[space elevator]] and are contacted by [[Governor Sloan]], who grudgingly accepts their presence in exchange for assistance fighting off Promethean forces attacking the colonists. Fighting with the colony’s [[Liang Dortmund Corporation]] security forces, Osiris fend off the Prometheans long enough for the colonists to get to safety, discovering that “Governor” Sloan is actually an aging [[smart AI]] undergoing [[rampancy]], and pick up clues that lead them to [[Apogee Station|Apogee]]. Governor Sloan arranges for a [[D79-TC Pelican|Pelican]] to take them to Apogee, where they find the Prowler and that Blue Team has already descended to the planet, seemingly without opposition. Osiris follow, fighting through more Promethean forces, including the [[Warden Eternal]], who introduces himself as Cortana’s servant and engages Osiris to prevent them from catching up with Blue Team. Defeating the Warden, Osiris catches Blue Team moving through a series of [[Teleporter|portals]] to try to reach the Guardian. Locke is the only member of Osiris who is able to reach Blue Team, and engages the Master Chief in hand-to-hand combat. He is defeated after damaging the Master Chief’s armor, neutralized with his own armor restraint, allowing Blue Team to board the Guardian which begins charging its slipspace drive, devastating Meridian with EMP shockwaves. Governor Sloan reveals that Cortana had contacted him earlier allowing him to evacuate as many of his people offworld as he could, and that he intends to join her “new dawn,” disappearing during the evacuation as Osiris climb the space elevator to reach their Pelican. Aboard ''Infinity'', Halsey deduces that another dormant Guardian lies beneath the surface of [[Sunaion]] on [[Sanghelios]]. Moreover, [[Roland]] figures out that the distinctive sound the Guardian gave off during its activation was actually a set of slipspace coordinates, and that if they can feed it into the Sanghelios Guardian they can follow Blue Team to their destination. Captain Lasky hopes that Osiris can catch a ride aboard it to Blue Team’s location, but is reluctant to involve the UNSC in Sanghelios’s civil war.

Blue Team arrive on [[Genesis|a lush Forerunner world]], noting the arrival of numerous Guardians. They are led to a console by a [[Spartan signals#Oly Oly Oxen Free|familiar signal]] from their [[SPARTAN-II training|training]], and encounter ragtag Covenant survivors dragged through in the wake of multiple Guardians’ slipspace drives, who believe that the planet was promised by the [[San'Shyuum|Prophets]]. They encounter the Warden in another body, who introduces himself as Cortana’s defender. As Blue Team proceeds closer to Cortana’s location, the Warden interrogates the Master Chief over his intentions for Cortana. When John responds that he intends to take her home, the Warden announces that they have become a threat to his and Cortana’s goal, and uses his Promethean forces in an attempt to stop them. After defeating this iteration of the Warden, they are contacted by Cortana who explains that she arrived at the planet aboard the wreckage of the [[Mantle's Approach|Didact's ship]] after it was dragged through slipspace, and that her rampancy was cured by accessing the Domain. She leads Blue Team across the planet, to meet her at the access point to the Domain itself.

The UNSC prepare to insert Osiris onto Sanghelios with an escort from the [[Swords of Sanghelios]]. Inserting near Sunaion, they find that the Covenant has launched a last-ditch effort to kill the Arbiter and reverse its recent fortunes. Osiris fight their way to the [[Elder Council Chamber]], hoping that the Arbiter can help them fight their way to the Guardian beneath Sunaion, which lies in Covenant hands. They arrive in time to evacuate the Arbiter in a Phantom to a Swords of Sanghelios camp, where they plan a counterattack on Sunaion. During a tense moment between Locke and the Arbiter, Cortana reveals her presence on the planet. Halsey figures out that if they can acquire a [[Constructor|Constructor Sentinel]] from one of the Forerunner ruins scattered across the planet, they can use it to activate the Guardian. Osiris are deployed to recover one from a nearby Forerunner facility, fighting their way through Prometheans and Covenant supported by the Arbiter’s air forces, which engage a Covenant {{Pattern|Shuul'se|Kraken}} walker to draw it out of their path. The Kraken positions itself between Osiris and the Constructor’s location, forcing them to board and destroy it. They recover the Constructor and deliver it to the Arbiter’s base, where Halsey reprograms it to activate the Guardian. The Constructor immediately sets about its task, and the Arbiter leads his forces in a massive assault on Sunaion to destroy what remains of the Covenant on Sanghelios. Osiris fight their way through, assisting the Arbiter’s warriors, but their priority is to reach the Guardian above all else. The Warden leads Promethean forces in Sunaion to try to stop Osiris, but is again defeated. As the Sunaion Guardian activates, it charges its slipspace drive, creating similar EMP pulses as those which on Meridian, devastating Sunaion and the Covenant’s forces. Commander [[Sarah Palmer|Palmer]] and Doctor Halsey use a Pelican to allow Osiris to board the Guardian, just as it enters slipspace. The Arbiter watches them leave, commanding his forces to clear Sunaion of the last of the Covenant.