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As of the August 8th, 2018 update, the Exchange House has arrived! There is a large variety of Stigmata available, but 5 are randomly choosen for your store per day. At each refresh 5 new Stigmata are added (though Stigmata can be repeated).
The currency used in the Exchange House is (Stigmata Resonators), which can be obtained from salvaging Focused Supply Stigmata or from Open World Adventure weekly resets.