After restoring the ballista, Aloy can now prove her worth in the reopened Arena — by killing dangerous machines in escalating challenges.
The Arena: Walkthrough
The Arena is divided into five tiers of increasingly difficult gauntlets. They are: Amateur, Intermediate, Skilled, Expert, Legendary. Each tier has four challenges, some of which will allow you to select your loadout, while others will require you to use an assigned one. You'll need to pay a Challenge Fee of Metal Shards in order to participate, but will be rewarded with Arena Medals when successful. These can then be traded for Legendary Weapons, Outfits, and more.
All challenges found in The Arena are included below. Please not that any challenges marked with an * asterisk have online leaderboards, which will rank your performance based on your selected difficulty setting. For more information on difficulty, refer to the following guide: Horizon Forbidden West: What Difficulty Should You Select?
Arena Medals can be collected by completing battles in The Arena. Speak to Dukkah at the Maw of the Arena and choose Trade Medals to purchase Legendary Weapons and Outfits with the Arena Medals you've earned.