Lock Me Up in Tartarus

"Thanatos has been banished to Tartarus," Hades announced furiously. Zagreus flared up in a rage. "You really banished him? How dare you?" Hades drew a large hand over his face, exasperated. "No, you fool. The Pact banished him!" (Angst for undying Underworld gods who cannot be killed in a way that matters.)