History speaks of the origin of the Clone Wars on Geonosis, and the first major clash between the Jedi and the Sith. The Colosseum draws inspiration from the fabled Petranaki arena, certainly, but was built with a more contemporary audience in mind. Located on the planet that serves as the new seat of the Brotherhood's central power, Arx, the structure was rebuilt and renovated from the shell of an ancient foundation that had barely weathered away against the planet's ever-changing climate.

High walls, tall enough for even the most savvy Jedi to find unscalable, line a large field of ancient sand and sediment the size of a holoball field. The spectators' chairs are divided into neatly organized sections with seats bunched close together to accommodate anywhere up to a few thousand people. At the center, an elongated platform “box” has been constructed with a central throne of stone with various seats of smaller scale lined beside it in both directions.

Two large holo-projection screens are set up on each side of the Colosseum, offering different angles of the fight via Holocam Drones.

While unassuming at first glance and looking very much like an archaic gladiatorial arena, the Colosseum features a medley of traps and surprises built into the floor and walls at random intervals. These obstacles include, but are hardly limited to: retractable nozzles that can shoot out gouts of flame; battery-coils that can spit out tendrils of electric current; receding floor panels with electric shock panels; deep pits with sharpened spikes and more. At some points, the ground can simply erupt upwards and create a concentrated, if not impromptu angular-platform that could be used as a springboard or temporary high ground. While seemingly random, these obstacles are handled and triggered by a sentient operator in a control room within.

You and another member of the Brotherhood have been set against each other in the arena. You may be fighting a dispute between your clans, for the honor of you superiors or friends, or for a personal slight done to you by your foe. What is certain is that the battle is to the death, before the roaring crowd of Arx.

Almost as important as defeating your opponent is playing to the crowd. In the Colosseum, not even the Grand Master can overturn the verdict of the mob. Should the tables turn on you, you may find yourself spared by the crowd for your performance. Overshadow your opponent enough, and you may seal their fate once and for all.