Twoshot. Right on the heels of the second flooding of the world, Hermes brings Demeter and Persephone to the Underworld, to beg for Hades to release Persephone's dead son, Zagreus. He doesn't because he cannot find him, but he offers Persephone the mercy of the Lethe instead: to forget everything, even her violation by her own father, and become pure and untainted once more.