The Argonite are a minor xenos species named after the Rogue Trader who first found one of their derelict vessels drifting through space. The ships were monochromatic, suggesting that the Argonites' vision is not comparable to humans. Their homeworld has yet to be discovered.
On the Argonite ship a weapon now called the Argonite Whistler was discovered. The weapon appears as a grey rod with a handgrip. When pressure is applied to the rod, different tones emanate. It was discovered by Magi-Xenologists that when a greater force is applied to the rod it will fire a tightly focused sonic beam.