Answer:
He ends up seeing the ghost of Banquo.
Step-by-step explanation:
During the banquet, we learn that the ghost of Banquo makes an apparition. However, Macbeth us the only one who can see it. This serves as an indicator to the reader of Macbeth's tormented and guilty consience. Banquo sits on Macbeth's seat during the banquet, metaphorically usurping the throne that Macbeth took in the first place.