made a 3D render, check it out at: [link]
I think Rym17 was the one who ordered a blade. First I made a saw blade for him -> this. And then he told me what a kai is.
So here comes the demon longblade. Made from pain, fire, and sufferin'. It is something that all opponents, foes and the user can feel while holding it. Something that makes a demon stronger but not a human. Ba... carefull!!!!
Copypaste the colored layer. Filter=> style; find edges. Turn it's blending to luminosity, put it back to be a background. Bring forward original background and set blending to multiply. Nothing you cannot handle. Yust use the right colors!