Treasures of Tokuno-
From time to time, the Order of Mages sees fit to reactivate the Treasures of Tokuno. During these times it would be best to head to the Tokuno Islands and start hunting as you can be rewarded with Tokuno Minor Artifacts. If you collect any 10 minor artifacts, you can exchange them for 1 major artifact. If an adventurer wishes to turn in 10 minor artifacts, he or she can simply travel to Zento and return the artifacts to their rightful owner.
(Thumbnail caption: The Treasures of Tokuno are always available on The Expanse.)