After running all around Prywen city, Fiona meets with Knight-Regent Jin Jae and learns about the fate of the Lost. She is sent to see what is happening at the Cynefin Mines, as none of the previous messengers have returned.
Tips and tricks
Make sure to equip your pickaxe when you receive it, so that you can start mining Iron and Stone nodes in the area.
If you see any Fast Travel shrines nearby when you are running your quests, it is always worth making a short detour to activate them. Future-you will be grateful to have the convenience of being able to travel back to that location from across the map.