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Sunaion is a city on the Sangheili homeworld of Sanghelios. The city is situated above the Csurdon Sea[note 1] on Sanghelios kept up by large columns.[2]



Sunaion was originally stone fortresses on the coast of Nuusra. It was founded by ancient Sangheili elders after dive-hunters and fishing skiffs found a Guardian in the sea. It was officially named Sunaion centuries later, when a temple was established on pillars over the site in the sea.[1]

Historic Usage Edit

For a long time, the Covenant Empire used the site to explore and worship the Guardian. Besides a few anchorites, the Human-Covenant war caused the city to mostly remain empty.[1]

Immediately after the war, the city was left neutral. Eventually revolutionaries would see it a good staging ground to attack Yermo and the rest of the State of Vadam.[1]

Covenant occupationEdit

By 2558, Sunaion had been captured by Jul 'Mdama's Covenant and turned into a major stronghold.[2] The Remnant planned on attacking the State of Vadam from here, however the Arbiter Thel 'Vadam learned of this plan. The Swords of Sanghelios created an outpost in Nuusra and planned on eventually striking the city.[1]

Battle of SunaionEdit

Main article: Battle of Sunaion

Sometime in 2558, Sunaion was attacked by the Swords of Sanghelios in an attempt to end Jul 'Mdama's Covenant that occupies the city. At some point in the battle, Fireteam Osiris was deployed into the city by Thel 'Vadam's Lich and were tasked with locating the AWOL John-117 who was on a Guardian construct near the city. However the Warden Eternal stopped them from getting to it.[2]




  1. While not stated in the article itself, this is mentioned in Canon Fodder - Sending Out an SOS link to Sunaion and mentioned in Sunaion's panel within the Locations section of Waypoint.