Act 5. Hippolytus takes his leave of Aricia, promising to marry her in a temple outside Troezen. On witnessing the tenderness of their parting, Theseus begins to have doubts about his son's guilt. He decides to question Oenone, but it is too late: Oenone has thrown herself to the waves. Theramenes brings news of his son's death: Hippolytus' departing chariot has been interrupted by a terrifying horned monster rising from the waves; mortally wounded by Hippolytus, its death throes drive his horses into a wild frenzy; in their flight, the chariot is dashed against the rocks and their master dragged helplessly to his death. In the closing scene, Phèdre, now calm, appears before Theseus to confess her guilt and to confirm Hippolytus's innocence. She finally succumbs to the effects of a self-administered draught of Medean poison, taken to rid the world of her impurity. As an act of atonement and in respect for his son's parting promise, Theseus pardons Aricia and adopts her as his daughter.