A fantasy longsword with a blade of polished, vapor-deposited diamond-carbon. The core of the blade is a transparent, smoky gray crystal, revealing a internal lattice structure. Overlaying this crystal core is a skin of glossy, black carbon fiber with a distinct twill weave pattern, as if the sword has been wrapped for immense strength. The cutting edge is a continuous, beveled line of flawless diamond, refracting tiny rainbows in direct light. The crossguard and pommel are made of darkened, brushed titanium, providing a stark contrast to the gleaming, composite blade.