Answer:
The mercy of the gods is unleashed when they are enchanted by the music of Ofeu. This mercy was just, since Orpheus was a very talented musician.
Step-by-step explanation:
Orpheus was in love with his wife Eurydice. One day Eurydice is bitten by a snake and ends up dying. Orpheus is desolate and decides to go and fetch her in the underworld, taking his harp, in case he needed to use his talent to convince the gods Hades and Persephone to release Eurydice.
This is exactly what happens and, moved by Orpheus' talent, the gods have the mercy to free Persephone from the underworld.