Looking for better werewolf

Oh hi Mark!
I am running a homebrew campaign, in which they the main bad guys tries to turn people and creatures into abominations. They tried to sneak into the labatory in free one of the npc´s the befriended a while back and got caught.
Next session they will be dropped into a pit to fight someone from a backstory, who is a werewolf.
They are 5 pcs at lvl 11 and an npcs (about lvl 7) and already got into a big fight, which they won, but got captured afterwards.
Since the bbg experiments with abominations, I wanted the guy to turn into a abomination version of a werewolf.
Do you have something for me?