Eryth Sea is a large sea that is situated on the Bionis' neck, where there are a large number of floating islands that are connected by transporters. On your first visit to this zone, you will be restricted to the eastern side of the map. It isn't until a story quest that requires you to help fix the transporters that the western half of the map is opened, allowing you to find all landmarks and locations. Eryth Sea connects to both Alcamoth and the High Entia Tomb. There is a special "weather" condition in Eryth Sea called Shooting Stars, where you have shooting stars falling to the ground.
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