Editing Olympia Vale

After Fireteam Osiris returned to ''Infinity'', Lasky ordered for the fireteam—along with Commander [[Sarah Palmer]] and Halsey—to travel to the Sangheili homeworld of [[Sanghelios]] to utilize the planet's inactive Guardian to pursue Blue Team. Vale and the rest of Osiris were taken to the planet's surface via a {{Pattern|Kmiro'sish|Lich}}, where they were tasked with finding Arbiter Thel 'Vadam while he was leading the Swords of Sanghelios against the [[Battle for Sanghelios|invading]] remnants of 'Mdama's Covenant at the [[Elder Council Chamber]] in [[Nuusra]]. As Osiris engaged Covenant forces, Palmer had [[Mahkee 'Chava]] deploy two [[HRUNTING/YGGDRASIL Mark IX Mantis|Mantises]] for the Spartans to utilize in clearing out the Covenant warriors at the Elder Council Chamber. Upon arriving at the chamber, Osiris battled the Covenant forces assaulting the building and fought their way inside, where they meet up with 'Vadam. With Osiris' help, the Swords of Sanghelios eliminated the Covenant forces at the Council Chamber. Moments later, 'Chava arrived in a Phantom and extracted the Arbiter and Spartans.{{Ref/Reuse|Id=H5SwordsofSanghelios}} Traveling to the Swords of Sanghelios' encampment at Nuusra, Osiris worked together with Halsey, Palmer, and 'Vadam to formulate a plan to utilize the Guardian. Osiris was tasked with locating a Forerunner [[Constructor]] at one of the Guardian's nearby support stations to allow Halsey to input commands into the construct to force it to activate the Guardian.{{Ref/Level|Id=H5Alliance|H5G|Alliance}} Palmer flew Fireteam Osiris to the support station, but was forced to drop them off just south of the facility due to the presence of a Covenant Kraken nearby. While the Spartans provided ground support, the Swords of Sanghelios assaulted the walker from the air. While the Arbiter's flight squadrons forced the Kraken into retreat, Osiris fought their way to an ancient Sangheili temple located near the support facility. After defeating several Prometheans at the temple, the Kraken arrived at the temple, threatening Osiris' mission. As the walker neared, the Spartans boarded the Kraken and destroyed its power generator from within. Osiris fled that doomed walker and traveled into the support facility via stolen {{Pattern|D'nomlhe|Banshee}}s. Once inside the station, Osiris retrieved a Constructor, but were attacked by Promethean forces. After battling their way back to an extraction point with the Constructor, a Phantom transported them back to the Swords of Sanghelios' encampment.{{Ref/Level|Id=H5EnemyLines|H5G|Enemy Lines}}

With the Constructor, Halsey inputted her commands into it and the construct took off to activate the Guardian. However, the Guardian was located in the [[Csurdon Sea]] next to the city of [[Sunaion]], the last bastion of the Covenant on Sanghelios. The Arbiter's forces regrouped and prepared to attack the city to eliminate the Covenant and give Osiris a chance to board the Guardian.{{Ref/Level|Id=H5BeforetheStorm|H5G|Before the Storm}} Traveling to Sunaion with a group of air vehicles, the Spartans, the Arbiter, and several Swords of Sanghelios forces deployed on the ground and [[Battle of Sunaion|engaged]] Covenant soldiers. While the Arbiter led his forces against the Covenant directly, Osiris eliminated Covenant [[Upisa'weri-pattern Shrike|Shrike anti-air emplacements]] to allow the Arbiter's [[fleet]] to move in closer to the city. Unable to receive air support for transport to the Guardian, Osiris accessed Sunaion's undercity to travel towards the construct's location. As the Constructor activated the Guardian, more Promethean forces arrived at the battle and began engaging the Arbiter and his forces. When the Guardian began rising out of the water nearby and started to activate its shockwaves, the buildings around the Spartans began to fall apart. As the Spartans moved to safety, they encountered the Arbiter engaging Promethean forces. The five battled the onslaught of Prometheans, which were soon led by the Warden Eternal, now utilizing another physical body. After a lengthy engagement, the five succeeded in defeating the Warden and the nearby Prometheans just as the Guardian prepared to leave. While the Arbiter remained behind to finish eliminating Covenant and Promethean forces, Palmer and Halsey picked up Osiris in the Pelican and flew towards the Guardian. A pursuing Banshee damaged the dropship, but Palmer was able to drop Osiris off on the Guardian's surface just as it entered slipspace and left Sanghelios.{{Ref/Level|Id=H5BattleofSunaion|H5G|Battle of Sunaion}}