Iwatsutsunome (Stone Mallet Woman?) is a Shinto Spirit, said to have come into existence from the blood of Kagutsuchi after he was beheaded by the sword Itsunoohabari. This is only mentioned in one ‘alternative’ version of the Nihongi where she is also the sister of Iwatsutsunoo.1
1. Aston. W.G. (1896) “Nihongi Volume 1: Chronicles of Japan from the Earliest Times to AD697”. Tuttle Publishing.
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