As you work your way through Final Fantasy XIV’s Endwalker expansion, there are several other things for you to do after you complete the Main Scenario quest. One of the many things you can do is complete the many side quests you find throughout the Endwalker regions.
For example, in Old Sharlayan, there’s a Mysterious Woman you can speak to and start the quest Secret in the Box. If you want to open the box, you’ll need to solve the riddle.
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