Don't forget, all evil things in this world come from video games. Rampages are inspired by first-person shooters as a more known example. XD
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On the other hand, relatively few of the rogue/Ninja animations can currently handle a swallow blade or other double-sided weapon. Which was my point here.
More importantly, though, while these animations could be revised easily enough, doing so and allowing for this distinct weapon type on rogues/ninja begs the question of what the Armory concept ought to be.