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The idea is the skill can make Julie a threat to traditional Lancer and Saber classes but can be used against any Servant who wields any Noble Phantasm that is a bladed weapon of some sort. Meaning someone like Jack for instance, whos main NP is a knife, Julie can land a blow of equal strength to a C rank NP release. Where Sabers are concerned if their weapon is a literal sword or a for a Lancer an actual spear (both bladed weapons) then Julie can achieve the same result. Now a Servant like Gilles, it Marie Antoinette the Skill isn’t effective against. An even better example is Iskandar who may wield a sword it isn’t a NP thus the skill doesn’t activate.