I had this idea after watching the Ewoks #9 review by Linkara/Iron Liz.
Somewhere in the ocean along the coast (likely where the Hoach empties into the sea) there will be an underwater dungeon inhabited by a truly gigantic oyster. Within this oyster is a very large pearl. Naturally, the first instinct is to sell the pearl to obtain fabulous wealth. However, clues leading to the discovery of the pearl also hint at a greater treasure within. I am not sure what that is but, for example, it could be a key to another dungeon with an even more valuable treasure that was long ago lost to the sea (or willfully sequestered within the oyster) and became encased in the pearl (the existence of magic allows clues to point towards an item that was lost at sea and later encased in a pearl).