In Curse Of Strahd, the leader of the Werewolf Den was Kiril Stoyanovich, who possessed an ability to shift to something far stronger than a normal werewolf. Many members of his pack had left the den, chasing Drusilla and Rudolph van Richten to Khazan's Tower. However, they were slaughtered there by The Pack, and Kiril met face-to-face with the Wolf-Father's true daughter, Shakti of the Wildhunt.
He requested that Shakti join him to come back to the Den, but could not guarantee her safety, and the group decided to let her go.