Material-S is a clone of Nanoha Takamachi created during the Dark Fragment Incident as part of the Unbreakable Dark system. She's best known by her true name, Stern the Destructor—though fans often just call her Stern. The "S" in her original designation is thought to reference "Stars" or "Starlight," both tied to Nanoha's identity. The name makes sense when you learn that "Stern" is German for "star."
She wields a device called Luciferion.
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