Here's a quick loredump on Ostermark, for those who might not be familiar with this province.
The League of Ostermark is one of the youngest Provinces in the Empire, founded in the 19th century after the destruction of their former capital Mordheim. If you don't know what Mordheim is, go watch a playthrough of Bloodborn and you'll get a good idea of what it's supposed to look like.
With the destruction of the capital—and the deaths of the ruling family and every major member of the government—the various towns and villages banded together to form the semi-democratic League of Ostermark.
That's right, Ostermark is a democracy. Sort of. The province is ruled by a council of Nobles who are lead by a Chancellor, which is their term for an Elector Count. Can't seem to dig up how the democratic process works, unfortunately. I suspect it's either land=votes or the largest landholders have an automatic seat on the council, and the council then chooses a first among equals, who is then named Elector by the Emperor.
Geographically, they have Sylvania to the south, the World's Edge Mountains to the east, and Kislev to the North, so they are pretty much surrounded by hostility. Their friendship with Karak Kadrin mitigates this to some extent, but the people of Ostermark have grown used to conflict regardless. The province can be split into four regions, two of which are forests; Gryphon's Wood to the north and the Dead Wood to the south (containing the ruins of Mordheim). Both of these are littered with ancient ruins. Between these are the Moorlands and the Veldt. The Moorlands consist of low hills, lakes and fens, and are sparsely populated aside from sheep and cactus fiefs. The Veldt is a large, open grassland perfect for the breeding and rearing of horses, and has been the cause of numerous border conflicts between Ostermark and Kislev, who both value that sort of terrain.
Ostermarker's are often criticised for being "half-kislev", and have a slight kislev accent. They also use archaic words and Kislev loan words in their speech. They are known for their love of life, horses, vodka, and dancing, and are characterised by their quick tempers, but also they are quick to moroseness. They have many traditions and superstitions about death, which are often described as "theatrical" and "flamboyant", and widows never remarry. Carpenters can make good money by carving out coffins, and priests of Morr are highly respected for their ability to ward off hauntings. Ulric, Taal, Rhya and Sigmar are also venerated by the people of Ostermark—so basically the Northern gods, but with Morr instead of Manann.
The capital, Bechafen, is located within Gryphon's Wood on the banks of the Talabec, and is famous for boatyards and its water powered sawmills, donated by the King of Karak Kadrin, with which it uses to produce the finest rivercraft in the Empire. During the Storm of Chaos (which hasn't happened yet) the Sigmarite Lector of Wolfenburg relocated here as it held the largest surviving temple to Sigmar in the east—currently, the Lector should still based in Ostland.