Date Shuriken

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==How to Obtain==
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==Derivations==
伊達 has many derivations and connotations in Japanese, but in the context of ninja weaponry this almost certainly refers to the Date Clan (伊達氏), particularly Date Masamune (伊達政宗), a 17th century feudal lord of Sendai, and his Kurohabakigumi (黒脛巾組), a Ninja military unit he founded. (Wikipedia)
ja:伊達手裏剣