Party kara Tsuihou sareta Sono Chiyushi, Jitsu wa Saikyou ni Tsuki S01E04 - Regarding the Rescue, Which Is, in Fact, a Farewell

With a new swordsman beside him, Margulus stubbornly tries to slay the hydra again. The Blades of Lightning members slowly make progress against the monster, but by the time Laust arrives on the scene, the hydra has undergone a terrifying transformation.