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Crossbow!
The first screenshot of one of Dawnguard's new crossbows. It looks dangerous enough, and the metallic inlay there looks almost Dwemer in design. It'd make sense for some of Tamriel's greates inventors to come up with the prototype version of such a weapon, but the most important thing, which we can't see here, is the THWUNK factor. Crossbows take a while to reload, so when they fire they need to look and sound deadly.