What mood is created by the witches Why do you think the drama opens with this scene?

The witches create a mysterious and foreboding mood with their supernatural presence and cryptic prophecies. Opening with this scene sets the tone for the rest of the play, foreshadowing the turmoil and dark events to come. It also introduces the theme of fate versus free will, as their prophecies spark Macbeth's ambition and drive his actions throughout the play.