Finally after finals at my university I have time to play some rpgs, and since I've reunited with my old gaming group I'll run my Cossacks & Tartars game.
Recently re-reading Jacek Komuda's books and Harold Lamb's Khlit stories I'm on the pulp/history kick.
I'll set my campaign in the south-eastern border of Polish-Lithuanian Commonwealth (i.e. Ruthenian Voivodeship, todays territory of Poland and Ukraine) during early 1620s. Here's map for my sandbox:
For the most part it'll be a historical game, however I'll plan to include some supernatural elements like witches, pagan slavic cults, cossack zombies, devils (like Rogalski and Boruta), jesuit sorcerers, upirs (something like a vampire), brukołaks etc.