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Most of the optional, open-world activities in Ghost of Yotei are fairly straightforward. You climb along a path or follow a fox to a certain destination, but reliquaries are both more scarce and more complicated. There is a reliquary in each of Yotei's main regions (not counting Nayoro Wilds), meaning there is a total of five in the whole game. The guiding wind will not lead you to them, and only a vague riddle offers any hints about what you're supposed to do with them.


Source: https://screenrant.com/ghost-of-yotei-reliquary-guide/