Board Thread:Questions and Answers/@comment-76.225.60.46-20130519011017/@comment-24246403-20131220134747

Heck, if we're just going for coolness, try condensing the water in the air around you to form a blade. O freezing a blade from water. Or making the air itself into a cutting tool. Then there's using bioK to alter your fingernails to be harder and sharper.