Acts 4-5: The Downfall
Seeking reassurance, Macbeth returns to the witches who give him three new prophecies: beware Macduff, no one "born of woman" can harm him, and he's safe until Birnam Wood comes to his castle. Feeling invincible, Macbeth becomes a tyrant, slaughtering Macduff's entire family.
Meanwhile, Macduff flees to England and convinces Duncan's son Malcolm to raise an army against Macbeth. The climax arrives when Malcolm's soldiers use branches from Birnam Wood as camouflage, making the forest appear to move toward Macbeth's castle.
Lady Macbeth, consumed by guilt, sleepwalks and reveals their crimes before committing suicide. In the final battle, Macduff reveals he was "born by caesarean section" (not naturally born), fulfilling the prophecy. He kills Macbeth and crowns Malcolm as the rightful king.
Essential Vocabulary: Learn terms like hamartia (fatal flaw), hubris (excessive pride), dramatic irony, and supernatural - these appear frequently in exam questions.