He takes the prophecies literal and believes he is invincible in battle.
When a servant reports that a huge army has been spotted Macbeth seems to lose courage, but quickly spurns the servant and requests his army to be put on.
Macduff is the scene stealer in Act V because he is the dominant character who transforms the entire play. He is the killer of MacBeth. After beheading Macbeth, putting his head on a stick, and presenting it to Malcolm, Malcolm is crowned the new king.