You open the door to walls lined with trinkets, treasures, and 333s seized from travelers past, along with bodies of animals dried out, as if something drained them dry of life, with no significant sign of physical trauma. In the opposite corner stands the hooded figure, and you begin to take a step back into the maze, but before you do, the creature bows before you. But before they say anything, their robes seem to deflate, billowing to the floor. Out flies a smaller creature, which you recognize as a bat (noctule?) which leaves the fortress through a tiny hole in the ceiling, leaving you alone with the fortress and giant stash of stolen items. You approach the robes and fish through to pockets, finding your 333 tucked in a pocket. Now to return to the town and report this mysterious criminal - who are they?