Alien Grunt

The Alien Grunt is a species from a dimension named Xen (pronounced as "zen"), known only by their ranks.

Lineage
Their origin is unknown, but many guess they are a species of Vortigaunts  which evolved into fearsome brutes, or, they are Vortigaunts which joined Nihilanth. Though they are actually another species of the same genus.

Appearance
Their anatomy is akin to a Vortigaunt, except they have a hornet gun attached to their hand, they have three same-sized eyes, and are taller than an average human.