Black Book trailer reveals a shadowy world of Slavic myths and card-based combat

Black Book is a card-based adventure-RPG about a young girl named Vasilisa, who is destined to become a witch. That sounds like a fairly straightforward setup for a tale of excitement and adventure, but Black Book is also set in the rural Russian countryside, and based on Slavic myths and folktales, and so things very quickly get darker than you might expect.
Vasilisa decides to ditch destiny in the name of love, but that plan goes sideways when her beloved dies under strange circumstances. The heroine, not one to give up easily, goes in search of the Black Book, a demonic artifact that legend says will grant a wish to anyone who can uncover all seven of its seals, a process that will involve everything from solving riddles and completing side quests to leading a "demonic flock" that will turn on you at the drop of a hat if you don't keep them in line.

Developer Morteshka said Black Book puts a heavy emphasis on "historical and cultural accuracy": In-game locations are based on real Russian villages and towns of the late 19th century, and the developers worked with "professional ethnographers to bring authenticity to the depiction of rituals and beliefs of the era."