Demons - W

Warlock = Warlocks are insidious Infernalists who seek out other Mages (anyone who is a user of Magick) and steals their powers and spells. Warlocks often kill their targets as part of the process of acquiring the Witches' powers, both eliminating a potential rival and making a sacrifice to their dark patrons in the process. Warlocks are the hated enemies of the Witches and have been at war with them since time immemorial.
Wolfen = The Wolfen are mortals who have signed their souls away to the Dark Rider, a demonic figure who offers them a pelt of wolf's fur in return. They can transform into Werewolves, assuming multiple variations of the Werewolf form, and they have access to black magick to boot. 
Wormwood = An unnatural planetary object, often heralds great doom or disaster. For more info see Wormwood.