Thri-kreen Species in D&D Forgotten Realms | World Anvil

Thri-kreen

Thri-kreen are carnivores with insectile features and two pairs of arms. Because their bodies are encased in protective chitin, they tend to eschew armor. Although thri-kreen don’t need to sleep, they do require periods of inactivity to revitalize themselves.
The Thri-kreen language doesn’t employ words in the usual sense. To demonstrate emotion and reaction, thri-kreen clack their mandibles and wave their antennae, indicating to other thri-kreen what they are thinking and feeling. Other creatures find this method of communication difficult to interpret and impossible to duplicate. To interact with creatures of other sapient species, thri-kreen rely on a form of telepathy.
Thri-kreen often use weapons of their own design, particularly the gythka (a two-handed polearm with a blade at each end) and a light thrown weapon called a chatkcha (a flat, triangular wedge with three serrated blades). Gythkas typically have shafts of bone and obsidian blades, while chatkchas are usually made of sharpened bone or crystal.

Find out more info here: https://www.dndbeyond.com/sources/sais/bam/bestiary#Thrikreen
Official D&D Sources:
Thri-kreen