Striga
A striga is a vampire like demon from Slavic and Polish folklore. It has owl like features, such as feathers, golden eyes and bird like talons. It can also shape shift into an owl at will. Strigas are strictly nocturnal, coming out at night to feast on the blood and flesh of the living. A striga comes from a person, usually female, that was born with two souls. This person will have various signs that they have two souls, usually having duplicated body parts, such as having two rows of teeth or two heartbeats. If this person is found out in life, they will be cast out of society to go die in the wilderness. If they're not found out they will continue to live like a normal person while they're still alive. On death one of the souls moves onto the afterlife while the other stays trapped in the body. When this happens the stiga begins to transform. They'll start out looking like they did in life, just with pale grey skin. Over time they will transform, gaining long need