The witches Three mysterious hags who plot mischief against Macbeth using charms, spells, and prophecies. Their predictions prompt him to murder Duncan, to order the deaths of Banquo and his son, and to blindly believe in his own immortality. The play leaves the witches' true nature unclear we don't really know whether they make their own prophecies come true, or where they get their knowledge from. In some ways they resemble the mythological Fates, who impersonally wove the threads of human destiny. They clearly take a perverse delight in using their knowledge of the future to toy with and destroy human beings.