Frieren: Beyond Journey's End (2023)

S1E24 Perfect Replicas

Title: Flawless Doubles Plot: To confront the challenges within the Ruins of the King's Tomb, the aspiring adventurers must first battle against the Spiegel, a mythical creature capable of generating flawless duplicates of anyone. This formidable foe forces each test-taker to face their own inner demons, as they strive to overcome the ultimate adversary: their own reflection.