Werewolf Den - Animated Image (Patreon)

 The open jaws of the wolf's head form a fifteen-foot-high canopy of rock over the cave mouth. Flickering torches light the way and from somewhere deep inside, you hear the echoing sounds of a discordant flute... 

https://imgur.com/a/GD7uhzn

My party never actually tracked down the werewolf den, but they were certainly ambushed by a werewolf raiding party. Turning the paladin in the party into a werewolf was one of the highlights of the adventure for sure. I rolled all their saving throws behind the screen so they had no idea if anyone succumbed to the curse or not...until the first full moon..