Tales of Zestiria – All Iris Gems (Full Earthen Historia)
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In Tales of Zestiria, you’ll have to hunt down Iris Gems to understand the underlying story of one of your biggest enemies. Collecting items is a big pain for tons of players, but eventually after doing all of the side quests, you’ll get your hand on every Iris Gem, and you’ll be treated to a full backstory on the events of the world before Sorey takes up the duty of Shepard!
In Lohgins, there’s a special tablet that allows you (once you get there in the story) to watch all of your Iris Gem videos, and collectively they make up the Earthen Historia.