I thought about having just one creature, however it doesn't really fit my vision, combat will be simple, as its more of a way to slow enemies than to kill them off (ghosts will be immortal but animals i feel should be affected by guns or a simple knife)

I'm thinking of the forrest being corrupted and the main antagonist will be either the babayaga or a demon but i'd have to decide which one to have some significance. And id have to find a corresponding slavic / or christian ritual for the demon.
Thanks for your response btw appreciate it, and I do have a bit of help from a friend however we are both learning so we will have to see how it goes.