Now my charms are all o’erthrown,
And what strength I have ’s mine own;
Everyone gathers round as things start to wind down, kind of like the windup to an Agatha Christie novel, with Prospero serving as Poirot and letting everyone in on the mystery. Rather than exacting some kind of terrible revenge on them Prospero takes the high road and gets all benevolent and forgiving. He even makes good on his promise to free Ariel. All live happily ever after.