The Avar Throne is the crown city of the Avar Imperium. Built around one of the Beacons, the Throne is considered one of the greatest cities of Evenor, focusing on industry and science. It is known to have an arena within, one where Senja fought and rose to fame.
The Avar Throne, along with the Imperium, was likely founded after the Architects left Evenor, as the Beacons had not been built prior to the Arc-Precursor war.
During the events of the Gloomfall, the Avar Throne appears to have fallen to the Gloom, including its arena.