Battle of Sunaion

The Battle of Sunaion was a conflict that occured after the Human-Covenant War, between the forces of the Swords of Sanghelios and the Covenant Remnant. The battle saw the final destruction of the Covenant as well the crowning of the Arbiter as Supreme Kaidon of Sanghelios by the Swords of Sanghelios.

The Prelude
Fireteam Osiris, an ONI special ops team, were allowed passage onto Sanghelios in order to continue their search for Blue Team, who had gone AWOL some time before. Arbiter allowed the Fireteam onto the planet for two reasons - primarily because he knew Blue Team's leader, Johnny, would not have defected from the UNSC without good reason, and also because he knew that a team of four Spartans would be a great asset in the upcoming battle. Immediately after being dropped onto the planet, Osiris aided Arbiter in pushing back a Covenant attack and destroying a Covenant Kraken, effectively pushing the last of the Covenant Remnant back to their final stronghold, Sunaion.

The Battle
The Humans had made a plan to reactivate a Guardian that rested beneath Sunaion in order to ride it to Genesis to intercept Johnny, and Arbiter planned his attack at the same time in order to maximise the destruction of the Covenant forces. Arbiter attacked with a huge fleet of ships and deployed Fireteam Osiris to destroy anti-air batteries to allow his fleet to decimate the city.

After the Guardian was activated, Promethean forces joined the battle and attacked Covenant and Swords forces alike, but Arbiter pushed through the chaos and helped Osiris destroy one of the Warden Eternal's bodies, and then watched as they boarded the Guardian and escaped into slipspace. With the Covenant forces eradicated, and the Prometheans deactivated, Arbiter declared that the battle was won, and that his forces had extinguished the Covenant's light forever.