GURPS Traveller: Alien Races 3 (2000)

From Back Cover:

Alien Races 3 offers an expose on the Ancients themselves, and examines in detail the biology, homeworlds, culture, and society of the enigmatic Hivers and cryptic Droyne. Included are racial and career templates, sample equipment and starthips, Ancient artifacts, and much more.

This book also includes a set of 36 Droyne "coyns" and instructions for predicting the future and making decisions, Droyne style.

Two new minor races are presented here as well:

• The Inheritors, a race of fluorine-breathers living on the shell of an ancient Dyson sphere and "improving" on the technology left behind;

• The Lithkind, a nocturnal species for which mating means death and death means rebirth, and who treat the opposite sex as taboo!