Hades

Backstory
Prior to the events of season 3, Medusa and Palutena ruled Angel Land together in peace. While Palutena fostered the growth of humanity, Medusa hated their kind, causing her to dry their crops and petrify people. In a fit of anger, Palutena changed Medusa into a hideous cyclops and banished her to the Underworld. Since then, Medusa vowed to overthrow Palutena and retake her position in the Palace in the Sky. She got her chance when she met Hades the king of the underworld. Together they successfully overthrew Palutena and took over Angel Island. That is until Tess was thrown into the fight when it was revealed that she was the missing goddess of lightning. Palutena, Tess, Garrison, and Sheila managed to take back Angel Island and banish Hades to a multiversal prison.