NieR: Automata's 3C3C1D119440927 DLC unlocks three challenging Colosseums after receiving a mysterious letter. This guide details their locations and Rank S rewards.
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The DLC introduces optional content and cosmetic rewards. Each Colosseum features six ranks with progressively difficult enemies.
Trial of the Sand Colosseum
Located in the desert. From the "Desert: Center" access point, look right (facing the desert entrance) for an orange diamond-shaped structure. A machine guards the entrance, but poses no significant threat. Completing the Trial of the Sand Colosseum quest with a Rank S finish rewards the Destroyer Outfit (A2).
Gambler's Colosseum
Accessible from the "Flooded City: Coast" access point. Follow the path to the coast (the same route used to protect the resource ship). At the end, locate a waterfall. Circle around the building to the left, finding a Resistance member guarding the entrance. A 1000G bribe unlocks access to the Gambler's Colosseum quest. A Rank S completion grants the Revealing Outfit (2B).
Underground Colosseum
9S ONLY: Located in the Forest Zone. Starting at the "Forest Zone: Center" access point, follow the left edge of the forest to a group of training machines near a large waterfall. Pass through the waterfall to enter (only accessible as 9S) and begin the Underground Colosseum quest. Achieving Rank S rewards the Young Man's Outfit (9S).