Cannon Busters are advanced robots created via a combination of science and magic.
They were thought wiped out along with magic, however King Bulgher secretly created one for his son called S.A.M. - who appeared to simply be a friendship robot. The ultimate form of a Cannon Buster is their War Golem form. An additional two Cannon Busters appeared in their War Golem forms as part of Locke's army which took over the Kingdom of Botica.