When fighting Chamberlain's Shadow on the last level, hit the switch he is facing. When you are about to begin the fight, the room gets darker, and the buttons will be released. Afterwards, he will release his minions that are after you. You only have a limited amount of time to press the buttons. Note: Sometimes you will have to press one or more of the buttons until Chamberlain's Shadow is hurt. To reduce a bar of his health completely, watch his shoes. There will be a toe sticking out. Butt-bounce on the toe. Do the same tactics until you complete the entire game, and therefore defeating Chamberlain's Shadow.