Golden Sea Corsairs
"The Uber of Vikings" as they would probably be described if Uber was a thing in a D&D campagin.
The Golden Sea Corsairs are the only faction to control the Golden Sea. They are found all around the coastline of the inland freshwater ocean. They make their gold sailing travelers up, down and around the Golden Sea for small toll fees.
It is unknown how many Golden Sea Corsairs they are, or where they live in the Golden Sea. There's rumors of a large island in the center that the Corsairs call home. But these are just rumors, the Corsairs protect the secrets of the Golden Sea with their lives; and their tenacity combined with their unmatched sailing expertise has made it impossible for any other power in Athos to conquer the Golden Sea.