A Dark Room with no Doors

When an unknown witch catnaps Warrior, the team goes into action. They know only that he is being held in a dark room with no doors. A mission to find him brings out all of the team, and leads to several of them needing immediate medical treatment. In addition, they run into trouble with the human authorities. Who is this witch who can create such havoc? What does he want? Their one ace-in-the-hole is the tendency of unknown witches to underestimate their team...and to not realize they will put so much power to work to find a cat.