Arachnoids were a type of sentient arachnid species whose legspan reached about 2.5 meters. Their bodies were coated with thick fur of black and gray hues, and they had four eyes along with strong back legs. One example of an Arachnoid was Ptak-Sok, who served as the copilot of the vessel known as the Black Widow.
The EMRG-50 Rail Guns were constructed by them.