Derfflinger is a sentient sword. Its first wielder was Sasha, Brimir's familiar Gandálfr six thousand years ago. Its current wielder is Hiraga Saito, familiar of Louise de La Vallière.
Derfflinger may be named after the SMS Derfflinger, a battlecruiser of the German Kaiserliche Marine, or the Derfflinger-class of battlecruiser.
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