Putting On the Chronotector! The Four Heavenly Kings' Attack! - S1.E81

While Eden questions Subaru who he really is, Koga, Souma, Yuna, and Shun encounter the Primary Pallasite Aegaeon who wants to test the Bronze Saints' powers himself. After telling the Saints about how Ikki put his life on the line to crack Aegaeon's sword, Shun has a hard time fighting him until Koga, Souma, and Yuna keep fighting the Pallasite, defending Shun. Burning his Cosmo to the maximum, Koga manages to give Aegaeon a crack to his sword, before Ikki arrives to save the Bronze Saints, taking over the battle.