Dig sites in the optional side areas unlocked by rubies will share artifacts. Any additional items you find are carried over into the next site in that region. Additionally, these artifacts are capped at the total number required to open all the sites in the region. For example, a region that requires 7, 9, 11, and 13 artifacts in its respective sites to open will have a cap of 40 total artifacts that can be found. Once you reach this cap for each artifact, you will no longer find that artifact, making finding the other ones much easier.
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