Kiril

From Adrian's Persons of Interest:
Kiril, the bastard tricked us. I once thought Werewolves or Lycans were men given in to their primal side but he was cunning even when he appeared to us as a human. He is what brought us into Barovia, tracking him in his Lycan form was a challenge, he even made a full leap over a river, I was able to tell from the depth of his footprints. Sigmund helped toss rope to the other side of the river and we crossed, only to get lost in the Mists that lead us into Barovia.
We'll find him in the mountains to the north, hopefully not all the Lycans or Werewolves are with him doing Strah'd bidding. Taking on a whole troop of them sounds like a nightmare. They worship the 'Nightmother' a Goddess of darkness. The closest parallel I could make is with Shar here in Faerun.