Ethereal

Ethereals is one of the master races that fight against X-COM during First Alien War. They are physically fragile race, the muscles are severely atrophied and the internal organs appear to be under-developed with sensory organs, including the eyes, do not appear to function at all.

However, Ethereals brain is well developed and draws on a high proportion of the body's blood supply. It possesses awesome mental power which allow for telepathic communication and telekinetic abilities. The telekinetic power defy the laws of physics known by humans. Utilising said power, this physically retarded that seems incapable of sustaining any life functions turn out to be the most dangerous species that X-COM forces faced during the First Alien War. Similar to high rank Sectoids, Ethereals can use its psychic to demoralise soldiers in combat, or even take control of their minds.

The Ethereals are alway seen wearing billowing orange robes to cover their frail-thin bodies. Unlike Sectoids, they prefer to send other races (especially Mutons) to carry out missions on their behalf. It isn't until late f war that the Ethereals invade Earth by themselves. The Ethereals also use mechanical robot known as Sectopod.