If you had a boatload of money and magic to waste, could you get a liqid metal weapon? Like a blade that can change shape, for example it could go from straight edge, to se , to hooked.
I had an idea of a weapon that takes the souls/ essence of any person it kills so you could use them to power golems, well maybe when the sword currently has souls you could see ghost-like whisps floating around on the surface. That would be awesome!
Or a sword that has to do with a dragon, and on the blade you could barely make out a blurry, dragon-like shape. You could also have runes shine on the blades when ever you hit something with them, and if they have magical powers, the runes change due to what power you\'re using. Or a sword with a water blade that ripples when ever you swing it around.