Naofumi’s last shield just manages to absorb the Emperor Dragon’s attack, but he knows he won’t be able to stop the next one. Before it can charge up, Atla rushes into close range to use her pressure point attack. Because it becomes more powerful the tougher the defense, she manages to knock the dragon back, and it fires its breath at the ceiling, flooding the den.
The water washes everyone back outside. Atla is fine, and her actions not only saved everyone, but bought Naofumi and the rest of the party time to recover and regroup. That night, Wyndia confirms to her and Fohl that the dragon is indeed her father, and we get a heartwarming sequence of the dragon gradually learning how to take care of a demihuman infant entrusted to him by a dying man.
It’s while reminiscing about her childhood that Wyndia recalls touching her father’s one upside-down scale—his weak spot. Fohl makes sure Wyndia is okay fighting her dad, and she says she is; she wants to say goodbye to him properly. Seeing these sweet kids warms a drunk Sadeena’s heart.
Before the sun rises, the party gets organized: Sadeena, Wyndia and Melty will use choral magic to restrain the dragon while Raphtaia and Eclair launch melee attacks. Atla is eager to help, but Naofumi insists she hang back, as her unique power to undermine ultimate defense will be their last resort. This appeases Atla, who adorably tells Fohl she’s the ace.
As the skies begin to brighten, the curtain rises on one hell of a dragon boss battle. After luring him out with the Wrath Shield, the choral girls encase him in a giant cube of water, where Sadeena transforms into her orca form and gives him the business, supported by attacks from the swordsmen.
While his offense attacks, Naofumi distributes shields and buffs to everyone. Despite the large number of combatants, everything is kept nice and tight and the battle is easy to follow. When the Emperor takes off the kid gloves and zaps everyone with vicious beams of light, Atla senses her time has come.
Having built up magical energy back at camp, she and Fohl rush the dragon, only for her attack to bounce off a veil he has raised. Fohl keeps bashing at the veil until it shatters, allowing Atla to charge up her pressure index point finger of death, targeting the dragon’s weak upside-down scale. Her attack, which proves decisive, is presented with some decent sakuga along with one final flourish from Kevin Penkin’s boss fight music.
While Atla was committed to get the job done even if it meant sacrificing herself, she lands in Naofumi’s arms exhausted but alive. He may need to have a chat about her maybe not going so hard next time. The disabled Emperor coughs up Filo and Gaelion, who are none the worse for wear. All that’s left is to finish off the greatly-depleted dragon, achieved with one more round of choral magic, with Gaelion assisting in summoning a great orb of water.
Sadeena dives into the orb of water, which parries the dragon’s final breath attack, and she retrieves the Emperor’s core. Then Raphtalia delivers one final Mist coup-de-grace, atomizing the dragon just as the sun rises over the mountains. All that was missing from this satisfying conclusion to the battle was a good old-fashioned victory fanfare. Wyndia sets up a grave for her dearly departed father, and to her surprise, Ren leaves some flowers and prays beside her.
The villagers thank the Shield Hero for protecting them from the Sword Hero, but Naofumi calls them out for manipulating Ren and departs in a huff. Ren is deeply contrite for what went down and doesn’t believe he deserves forgiveness, but Wyndia forgives him anyway.
She actually knew he was manipulated all along, and that he really shouldn’t have been the target of her ire, but she made it so anyway. Both she and Ren have grown a lot, and are ready to move forward together as allies of Naofumi.
As for her father, he’s actually still around, as Gaelion is his new vessel. However, in the interest of allowing her daughter to carry on with her life, he’ll keep his presence secret, and asks Naofumi to do the same. Rather than give Filo her XP back (though he did absorb her curse), Gaelion grows big enough for Wyndia and Naofumi to have a celebratory dragon ride.
While this only makes the wagon-pulling Filo more jealous. However, as Naofumi says, all’s well that ends well, and they’re in a good place with the Phoenix drawing closer to its awakening.