The Barony of Oster is one of the most fertile of the Southern Baronies, and home to vast acres of farmland. The produce grown is traded widely throughout the other Baronies, though in more recent years border squabbles have led to less free trade.
The capital city, Aldonis, gave its name to the treaty signed within the palace which ended the last war between Island City and the Southern Baronies.
Of particular note is Marn (and the surrounding Forest of Marn). Tales of a great tower within have never been substantiated, though those who go in search of it are seldom seen again.