Vilkacis

The Vilkacis are from Latvian mythology. Its name means “wolf eyes.” They are created when someone speaks against God publicly. When this person sleeps the darker part of them separates into the Vilkacis. In this form they spread disease and kill others. They can be killed as easily as a regular wolf but are significantly smarter.

Citations:

Maberry, Jonathan. Vampire Universe: The Dark World of Supernatural Beings That Haunt Us, Hunt Us, and Hunger for Us. United States, Kensington Publishing Corporation, 2006.