Darius chuckled and gently patted Yume on the shoulder, in a comforting gesture.  When he spoke, however, it was to Jade.<br/><br/>"The easiest way to shout a warning so I can banish them.  Aside that, they cannot pass through metal, and tin is poisonous to them.  When seen in a mirror, their veins glow in a red pattern; that is probably the only way to see one before it is upon you.  If you can, however, you can spear it to the ground with a sword or metal arrowhead."