This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Valravn (Danish)
The Valravn is a creature with origins in Danish folklore. In particular, accounts of their existence claim that valravne are created from when ravens eat the heart of men slain in battle. As they are created in blood, their actions are the same.
To take the form of a knight, a valravn must first devour the heart or drink the blood of a child. Valravne either take the child by force, or are promised it in exchange for help. Other accounts describe Valravn as a monster that is half-wolf and half-raven.