From the back cover.
Alien Module 3: Darrians
This Alien Module explores the mysterious and enigmatic Darrians and their domain within the Spinward Marches. With access to incredible technologies, including the apocalyptic and legendary Star Trigger, the Darrians have nonetheless only a relatively small empire, far from the Third Imperium.
Alien Module 3 shows you how to create Darrian characters, and explores their psychology, culture, society and technology. New Darrian ships are featured, and every world within their domain is fully detailed, allowing your characters to walk on their surfaces and visit their people.
To use this supplement, a Referee will require the Traveller Core Rulebook.