I made this using the wheels off the troll assult wagon and the piece infront of the evil wizard is from the drawbrige defence. It is pulled by two skeletal horses and has a door at the back that can open. There is a little hut thing in the middle, in which the king is trapped in (although this is not the prison carige). There are three crossbow posts on the top, in which three skeletons man.
I hope you like it because i had some trouble thinking it up.
Thank you for looking at my creation!