How do the properties of density, sharpness, brittleness of a material impact on the usability and the design of weapons.
Would it cause weapons to be designed vastly different or would it make normal weapons more effective?
The density of steel "ranges between 7,750 and 8,050 kg/m³". For diamond it is just 3,500 to 3,530 kg/m³. (just as an example for vastly different densities)
If we were to create a regular long-sword or katana out of a material about half the weight as steel, but with similar properties regarding sharpness and brittleness, would it be as useful? What if the weight was even lower than that? It would have a weaker impact for sure, but it could be swung faster, too.
Now what if we improve the sharpness? If a blade was significantly lighter, but also sharper, it would be a lot easier to use against "soft" targets. But the light weight would probably make it useless against "hard" targets if it can't cut through the hard layers.
What kind of new designs of weapons (all kinds of weapons) and armor would be possible and useful if such a material existed?