a shapeshifting nanobot swarm boss for a futuristic RPG. The swarm should be capable of transforming into various forms such as a beast, a cloud, or a humanoid figure. It should have a metallic sheen with glowing LED lights, and be composed of countless tiny particles that can aggregate and disperse. The design should convey a sense of advanced technology and adaptability, fitting for a challenging boss encounter in a sci-fi setting.