Sedna borders the Novan duchy of Elath and the two are important trade partners. Despite and because of that, relations between the two duchies, and by extention their parent domains, have been strained, due to an event in their shared history.
At the game's start, the ruler of Sedna is Talarist.
Sedna is the name of the Inuit goddess of the sea. Keeping with the astronomical theme naming of the game, Sedna is also the name of a minor planet in the outer reaches of the solar system, and a large lowland area of Venus.