From the Back of the Book:
They tower over mere human warriors and adventurers. In a savage world, they hunt--and all else is prey. Wandering the sandy wastes and stony barrens under the crimson sun, thri-kreen are the most skilled trackers, the most barbaric gladiators, the most implacable of foes. Mysterious and savage, the mantis people have been a closed book. Until now...
Thri-Kreen of Athas enters the world of the nomadic thri-kreen--a world governed by tokchack, the clutchmind, and tikchak, the hunt-mind. From hatching to hunting to coming of age, the secrets of the thri-kreen are at least revealed. From their formidable combat abilities to the subtleties of their psionic powers, this accessory explores every aspects of thri-kreen life. For players, there are new rules and new character kits--offered to DARK SUN game characters for the first time!
A special adventure for thri-kreen characters, The Taste of Fear, is included. Dire events in the unknown North trigger ancient racial memories. What terrors lie in the lost secrets of their past?