Pack of the Dreadwolf
Hundreds of years ago, Lord Strahd von Zarowich died and rose again as a vampyr. His first acts as the Dreadlord of Ravenloft was to turn on his previous allies. Most fell within days and the valley succumbed to his darkness, but the Order of the Silver Dragon proved to be particularly resilient to Strahd's standard undead creature. Determined, Strahd empowered a pack of werewolves, and empowered their alpha, the Dreadwolf.
The pack was tasked with putting an end to the Order by hunting and killing the Dragon Lord Argynvost while Strahd engaged his knights elsewhere. The Dreadwolf himself killed the Dragon Lord, and as a prize was granted his skull. Since then, the pack has worked to terrorize the people of Barovia and allowed occasional leave into the material plane to hunt for new blood.