The Crystal Pendulum is a large, wagon-mounted pendulum appearing in the Price of Peace campaign in Heroes of Might and Magic IV. King Gavin Magnus placed the magical Rainbow Crystal he had aquired as the centerpiece of a great magical pendulum, and when he set it spinning, anyone who came within a certain distance of it fell under his will. King Magnus could use the Pendulum to steal the will of anyone who opposed him, and planned to take over the world, placing everyone under the Pendulum's control to bring everlasting peace and order.