The third module in the Volturnus series, Starspawn of Volturnus introduced one of Star Frontiers most notable new races, the Mechanons.

Discovering that the Sathar were monitoring the reawakening of the Eorna (the 'father' species of all other sentient species on Volturnus) and were now sending a fleet to destroy the Eorna once and for all, the heroes are sent along as emissaries to all of the other sentient species to recruit them in the struggle against the Sathar. This 32-page module details a number of interesting diplomatic challenges for the players and ultimately culminates in a large ground assault by the Sathar. The players have to hold off the Sathar, their cybernetic attack monsters and their assault vehicles with only the resources of the (mostly) primitive species that they've rounded up.