A Bestiary of Slavic Monsters
All of these planar creatures have links to Slavic mythology.
Sources: Margarita and Jon Winter-Holt. This is a homebrew addition to the lore. Margarita notes: While this adaptation is heavily based on Slavic folklore and beliefs, I must warn you. The amount of actual information we have on pre-Christian Slavic deities is so minuscule that building any kind of lore out of it is impossible. However, there’s a lot of folk beliefs about things these deities are thought to represent.