Board Thread:Speculation House/@comment-1173941-20130216005034/@comment-3387274-20130614083249

no, magic has never been mentioned, except by fans speculating. And if you look closely you see that all of the colourful stuff comes from the chambers in the rapier, and not Weiss. The recent twitter picture seems to imply that the chambers contain coloured crystals, which would be broken by the hammer when the sword is "fired". And that's why Myrtenaster is described as a Dust Rapier.