Reason to Fight (戦う理由 Tatakau Riyū) is the 16th episode of the Tears to Tiara anime adaptation.
Summary[]
Arthur wanders in grief and guilt, horrified at his deed. Gaius attacks Avalon, but the Gaels are too distraught, as Arawn is in a coma, and Arthur has run off after stabbing him. Gaius thinks it will be an easy victory. However, Rhiannon talks to the warriors in the courtyard, assuring them of Arawn's recovery and Arthur's return. She then takes charge of their leadership and rouses their batle instincts. Lyr and Rathty marvel at this change in her timid nature. At the Gaels' camp, Ogam tells Morgan and Octavia, that all contact with Avalon was lost, and he suspects a trap, well-laid by the Empire. He proposes a wait of four days, and sets off to find Arthur. At Avalon, Lyr and Rathty hold off the siege towers scaling the walls. Gaius marvels at Rhiannon's resolve. At an old shrine, Arthur find Ogam and thinks that he is there to punish him, but Ogam tells him of his sorrow when the Second Moon fell from the sky and destroyed his homeland. He claims to be a dragon, but Arthur disbelieves him. He says he hates the enemy and that is his reason to fight, and he puts the question to Arthur. Ogam tells him he is bounded by empty words and has deserted his companions, hence losing the right to lead them. Arthur is confused, and Ogam tells him to go to "Gorsedd Arawn" or Arawn's Throne to find the answer. Meanwhile, Morgan and Octavia set out alone for Avalon, fed up of waiting. Meanwhile guardian Boar Demons attack the shrine as Arthur struggles with his doubt. In battle, he calls out Arawn's name, and realizes that Arawn was a true friend to him. He is then cleared of all doubts. At that point, an Electrum Golem stored in the shrine attacks them, and Ogam transforms to his real blue dragon form and fights it to let Arthur escape. Arthur sets out for the Brigantes tribe forest.
Morgan and Octavia, disguised as Empire scouts, had their identities exposed while passing through the Empire's camp. But thanks to Llyr and Rathty, they make it to Avalon's safely. Gaius grows impatient, and orders the 3rd Legion to reach Avalon quickly with the battering Ram.