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Atmos Ring

The Atmos Ring is a large ring surrounding Griswall. The ring measures 4.6 km in diameter and 14.5 km in circumference. The structure houses a synchrotron particle accelerator, where an accelerating particle beam can travel a closed-loop path. The Atmos Ring can accelerate particle beams to an energy of 6.4 teraelectronvolts (TeV).These particle beams create mesons that decay into muons to perform muon-catalyzed fusion, which provides power to Griswall. The Atmos Ring uses the residual synchrotron radiation to support research into materials science, atomic and nuclear particle physics, and developing new medicinal drugs.

The Atmos Ring also features a defense system using the decayed muons. Large watchtowers divide the Atmos Ring into sections, and each watchtower supports a Meson Cannon. Aurelia designed Meson Cannons to weaponize the decayed muons and fire them at attacking aircraft or missiles. They ended the Meson Cannons's construction prematurely due to rising development costs, political considerations for neighboring countries, and the lack of an immediate threat.

The Atmos Ring was designed to complement the appearance of the urban landscape. It re-uses many of the medieval ruins that surrounded the city's old town. The Atmos Ring also uses waterproof gates to prevent flooding from the river that encircles the ring. With the old town situated inside the ring, this design presents a landscape reminiscent of a medieval castle with a moat.

During the Aurelian War, the Leasath armed forces occupied Gaiuss Tower and turned it into the army's central command. Leasath's commanding officer, Diego Gaspar Navarro, also used the tower to hold lavish feasts to celebrate Leasath's success.

Towards the end of the war, the Aurelian military liberated Griswall and regained control of Gaiuss Tower with the help of the Aurelian Liberation Corps. Navarro fled capture and escaped to Sentry Island.