The Shock Trooper is the most intelligent species of the Race X Aliens. Physically, they are bipedal with four arms and have a posture that vaguely makes them resemble that of a Vortigaunt but with many key differences which show that they behave more like grunts. They communicate by using these 17 words: 
"blis"
"dit"
"dup"
"ga"
"hyu"
"ka"
"kiml"
"kss"
"ku"
"kur"
"kyur
"mub"
"puh"
"pur"
"ras"
"thirv"
and "wirt"
They combine these words to make sentences, and they domesticate pit drones.