Muton

Mutons is one of the sentient races that fight against X-COM during First Alien War. Although they're sentient, the Mutons are merely foot soldiers and rely on telepathic commands of their master, the Ethereals. If a Muton was separated from the telepathic link, it will be die from mental system break down.

Mutons is physically strong race, with numerous cybernetic implants for enhance the cardio-vascular system and the senses. The green "skin" appears to be an organically created protective armour which is grafted onto its purple body, this made armor-piercing weapon ineffective against a Muton. The reproductive organs were surgically removed, rely on the cloning method, like other races.

It's clear that Mutons are war race and nothing else. While they are indeed skillful combatants, fact that Mutons are controled by the Ethereals become their weakness. First, the Mutons have relatively low intelligent and short attention span. Second, the telepathic link made them vulnerable to psionic attacks.

Mutons have a particular appetite for consuming raw flesh of any kind, which they need for sustenance like earth based carnivores. Since the Mutons are controled by Ethereals, they hierachy are made purely of low ranks soldiers, engineers and navigators.

Mutons is only race known to accompanied by two types of terror races, the Celatid and Silacoid.