The Worldline Zero is a sleek, futuristic sword with a glowing blue energy blade that emits a subtle trail of light when in motion. The hilt is crafted from dark metallic alloys with intricate geometric patterns, featuring a small circular energy core at the base that pulses with a soft blue glow. The blade itself is semi-transparent with a crystalline structure, giving it a high-tech and otherworldly appearance. The overall design is symmetrical and streamlined, emphasizing speed and precision.