Oh, I'll check that out! :)
Inspiration is slavic mythology and pagan rituals dating around 900 AD. Karachun is an actual slavic spirit of frost. Besides encounter with spirits I want to add crafting based on herbs etc. with historic correct medical use. I did so too in my last adventure game The Plague Doctor of Wippra. https://store.steampowered.com/app/1811740/The_Plague_Doctor_of_Wippra/