The arena is set floating around clouds in the sky, with a Warp Pad in the front of the structure, a four colored lozenge symbol of the Great Diamond Authority behind it along with small circles (resembling the Galaxy Warp). There are stairs to the left and right of the entrance which lead to the arena's center. The arena is in ruin: the structure shows signs of damage throughout, debris can be seen floating nearby, and a significant portion appears to be missing. Above the entrance to the arena are four large octahedrons colored and positioned in the design of the Great Diamond Authority symbol, with the pink portion somewhat destroyed. Three statues of Gems holding weapons can be seen in the center of the arena. The first one on the left wields a sword and appears very similar to Yellow Diamond. Her gemstone is placed on her chest. The second Gem on the right wields a spear and has her gemstone placed where her nose would be, similar to Jasper's. The third Gem on the far right has her gemstone placed on her forehead and wields a mace. The fourth Gem statue is on the far left, but cannot be made out due to being destroyed save for the legs. Gem writing is seen on the columns next to the statues. Hexagonal holes that look like windows can be seen underneath the structure on the ruined end.
Pearl mentions that some of the earliest battles for Earth took place in this arena during the Crystal Gems'rebellion against the Gem Homeworld. This was where Pearl first understood the concept of chivalry and what it meant to be a knight: to be completely dedicated to a person and cause. Throughout the episode, Pearl tries to instill this concept into Connie with regards to Steven as she teaches her how to fight with a sword.
Steven and Amethyst participate in Pearl's training competition at the arena. Steven and Amethyst later hold a fight here to determine who is the worse Gem. The battle leaves a fair deal of collateral damage on the arena, much to Pearl's dismay.
Ancient Sky Arena • Astral Plane • the Barn • Beach City • Beach City Woods • Beach House • Crystal Temple • the Forge • Gem Battlefield • the Great North • Hessonite's Warship • Secret Temple of Secrets