The Legion arena is a small pit made of walls of scrap metal put together to form a post-apocalyptic colosseum.

If they travel to Cottonwood Cove with Boone, Boone will immediately attack all legionaries on sight, causing them to turn on the player character (unless a Legion disguise is worn). If the Courier has not yet been invited, the guards at the Fort may be hostile. Standing on top of the hill near the entrance will allow a view of other tents and structures off in the distance that cannot be visited. To the southwest, there are more tents, another bar, and the weather monitoring station, which includes Mr. In the center of the camp are the arena and Caesar's tent. To the north of the entrance past the tents is a small bar. On either side of the entrance are sleeping tents. The Courier must either be invited when exiting The Tops after completing Ring-a-Ding-Ding! (by Vulpes Inculta, who will be waiting outside, or by Alerio if the player character has already killed Vulpes, eliciting a comment from Alerio), or when For the Republic, Part 2 has been completed to the point when one must report to Colonel Moore to inform her that the Great Khans have been dealt with. However, it cannot be taken until certain events take place in-game. To reach the Fort, the Courier must use the barge at Cottonwood Cove.

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