NieR: Automata's 3C3C1D119440927 DLC unlocks three challenging Colosseums after receiving a mysterious letter. This guide details their locations and Rank S rewards.
The DLC introduces optional content and cosmetic rewards. Each coliseum features six ranks with progressively difficult enemies.
Located in the desert, access this coliseum from the Desert: Center access point. Zoom out and look to the right for an orange diamond-shaped structure. A machine guards the entrance, but poses no significant obstacle. Completing the Trial of the Sand Colosseum quest rewards the Destroyer Outfit (A2) at Rank S.
Starting from Flooded City: Coast, follow the path towards the coast (the same route used to protect the resource ship). At the end, locate a waterfall to the right. Circle around the left side of the building to find a Resistance member guarding the entrance. A 1,000G bribe unlocks access to the Gambler's Colosseum quest. The Rank S reward is the Revealing Outfit (2B).
9S ONLY: Access this coliseum from Forest Zone: Center. Follow the forest's left edge until you find machines training near a large waterfall. Passing through the waterfall grants entry (only as 9S), initiating the Underground Colosseum quest. The Young Man's Outfit (9S) is the Rank S reward.