The Ghost of Banquo

McDuff is haunted by the ghost of Banquo. He can't enjoy any of this position of power that he's taken because it's not his and because he could always be exposed. It's a morality play without the preachiness in the in the way that like the traditional morality plays literally often had something like a sermon at the end. The body just keeps stacking up, even when he's with his things who have all pledged their loyalty.