From the PDF Introduction
The Psionics Handbook Web Enhancement
These psionic monsters are presented according to the rules set forth in the Psionics Handbook. Without the Psionics Handbook, some of the nomenclature and powers of the creatures below may be obscure and difficult to utilize. The psionic monsters included with this article include the gem dragons (amethyst dragons, crystal dragons, emerald dragons, sapphire dragons, and topaz dragons), su-monsters, and thri-kreens.