Sword Valley, aptly named because it is located on the sword the Mechonis used to attack the Bionis, is home to the battle you see at the beginning of the game. There are large gates blocking the way, but you don't necessarily have to open some of them. In order to open them, though, you will need to use a console, some of which have locks on them, requiring you to use another console to unlock the former. Note that once you clear the Mechonis Field part of the game, this area (and Galahad Fortress) become inaccessible.
Note: This place has nothing but Mechons as enemies, so either bring Shulk along or purchase Anti-Mechon weapons at the beginning of the map.
Note: The items are listed in the exact order as you input them into the Collectopaedia, so it's easy to know which one(s) you are missing.
Guide Author Ben Chard, Jarrod Garripoli, Seren Morgan-Roberts
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The Bionis and the Mechonis, two great titans, their remains the scene of an epic adventure is about to begin. The guide for Xenoblade Chronicles: Definitive Edition features all there is to see and do including a walkthrough featuring coverage of all Chapters, Quests, Affinity Charts, and much more. Including an in-depth walkthrough of Future Connected, the new story and all of the new changes that Definitive Edition brings.
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Full coverage of the both the original tale and Future Connected