And I Must Scream: Apparently the Mirror Hero is still aware of everything that's happening even as Kazuki uses his weapon to fight his former allies.
Came Back Wrong: Kyo brings Kazuki back as a mindless homunculus, using the Mirror Vassal Hero's soul as a substitute.
Curb-Stomp Battle: Raphtalia manages to incapacitate Kyo's mutated chimeras instantly.
Magic Mirror: Kyo grafted the soul of the Mirror Hero into Kazuki's body, allowing him to use the Vassal Mirror and its Light 'em Up abilities.
Shadow Archetype: The opening of the episode creates a parallel between Naofumi and Kyo before they were summoned to their respective worlds. Naofumi spent his time selling merch and leading raids in the games, while Kyo played Mad Scientist in his games. While Naofumi was a nerd who had diverse interests and tried to live a normal life, Kyo was a Chuunibyou so obsessed with his games that his body and mind eroded, eventually committing suicide when his account was hacked. While Naofumi is a Humble Hero who wants to keep what he has, Kyo's Evil Plan is to flood the world with the Wave of Calamity as a part of a sick, twisted Power Fantasy.
Snake People: Some of the monsters summoned in the waves resemble Naga.
Suicide Attack: Kyo's mutated minions use a cursed sword that self-destructs when Naofumi's party defeats them.
Tengu: Some of the monsters summoned in the waves resembled them.
