Twelfth Night is an Ars Magica 3rd edition Saga supplement, the fourth and final chapter in the Four Seasojns Tetralogy. In this sprawling epic, characters and their decrepit Winter Covenant msut endure the wild machinations of mad wizards and the onslaught of righteous Crusaders, only to face death itself. For without its demise the Covenant cannot be reborn. Without its death your Covenant cannot return to Spring.