Nirohijuma

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According to one legend, Muramasa blade with blade Masamune lowered into the river overgrown with lotus. Lotus leaves unscathed skirted sword Masamune sword Muramasa dissected them to pieces.

Also said that, once exposed, Muramasa blade will not come back into the sheath until acquainted with the taste of blood, whether it is even the blood of his own owner. According to Japanese legends, such weapons can awaken the "blood lust" to those who would venture to use it.