The three witches in Macbeth are the driving force for action. They predict the future and persuade Banquo and Macbeth to take action in order to make the prophecies come true. They use supernatural and hallucinating images and acts to convince people of their connect with the spiritual world where one can see the fate unfolding.
Their abilities to brainwash and seduce Macbeth an Lady Macbeth effectively starts the chain of murders that leads to complete instability of the Scottish kingdom.
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