This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Vrykolakas (Greek)
Vrykolakas is a harmful, undead creature in Greek folklore. It shares similarities with numerous other legendary creatures, but is generally equated with the vampire of the folklore of the neighbouring Slavic countries. While the two are very similar, a vrykolakas eats flesh, particularly livers, rather than drinking blood, which combined with other factors such as its appearance bring it more in line with the modern concept of a zombie or ghoul.
The Greeks traditionally believed that a person could become a vrykolakas after death due to a sacrilegious way of life, an excommunication, a burial in unconsecrated ground, or eating the meat of a sheep which had been wounded by a wolf or a werewolf.