Excalibur is a legendary sword with a sleek, double-edged blade that tapers to a sharp point, featuring a subtle wave pattern along its length reminiscent of flowing water. The hilt is ornate, with a crossguard shaped like intertwined branches, and a pommel that houses a glowing, blue gemstone, symbolizing its mystical power. The sword's surface is polished to a mirror finish, with faint runic inscriptions along the blade that glow when wielded, indicating its divine origin and enhancing its photorealistic historical fantasy aesthetic.