The old timers tell stories of swords that were finely wrought and yet cruel: setsuninto, killing swords. They were weapons whose inmost essence drove their owners mad. Other blades were as cruelly beautiful, but imbued with a spirit that inclined to do good. They sang in their scabbards to warn of danger; they were bright and clear and miraculous things and, in the right hands, could be katsujinken, life-giving swords.
— John Donohue, Kage, prologue
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