The Traitorous Gold Saint! Ionia versus Kouga! - S1.E42

Kouga and Yuna reach the House of Capricorn where they meet Ionia and learn from him his reasons for betraying Athena. Kouga attacks the former Headmaster of the Palaestra, but is once again immobilized by his Domination Language technique, and his Darkness Cosmo is brought out. Before Yuna is able to help Kouga keep the Darkness Cosmo at bay, Ionia buries her in a rubble of books, facing Kouga alone. However, after succeeding to repress the Darkness Cosmo in his heart, Kouga awakens his Seventh Sense and finally kills Ionia with the legendary Pegasus Comet Punch.