[quote=@Burger] I did, I thought. I never said people other than her couldn't wield it, I said that it was so heavy it was difficult and bizarre to use. The blade becomes weightless when swung in clean arcs, which is how Yui uses it. Okinami isn't actually a sword meant for brutes, it's a sword that relies on perfect technique. A brute would be thrown off balance because the blade can shift from near weightlessness to super heavy in a split second. The point of the sword is its weight, sort of. It's not just a big sword that cleaves things in twain because it's big. It's supposed to be a sword that's used with non-standard forms. A second body rather than an extension of the arm, so to speak. And Yui isn't supposed to be a master of it. She has some aptitude, but she's still supposed to learn how to perfectly use it. [/quote] None of this really makes much sense, in my opinion. The description of the weapon doesn't even mention how it is able to become "weightless" since it would need some kind of mechanism to work like that. This isn't fantasy, but rather sci fi so things need an explanation, even if it's one that requires suspension of disbelief to work. On that subject, if the blade becomes weightless, it's contradicting description because its weight will be useless if it loses it while being swung. You can't really disregard conservation of momentum like this without an explanation that fits the setting.