Altunian
Towering over any of the other sentient species of the Mizar System, these scaled beings measure in at an average of 245 cm. Indigenous to the central planet of Mizar Altuni, their bodies are able to absorb massive amounts of thermal energy from the nearby twin stars of Mizar and Alkaid.
They wanted us to be the horrible beasts that kept their slimy polyps safe at home. Instead, we presented our commonalities, our strength of will and purpose, our desire to uphold the cosmic truths of the world. For that, we were granted our place as leaders in the Mizar Alliance.Relying on thermal energy to keep their blood warm, Altunians can usually be found near natural hot springs deep underground on their homeworld or exploring the sun-drenched surface. On other planets or while traveling, they wear specialty Thermal Skin, a tight-fitting undergarment that has thermal energy passed through it. These can be recharged with solar or plasma energy.
Basic Information
Anatomy
The average Altunian possesses long, powerful legs that support their thick, heavy torsos in an upright position. An elongated neck ends in an oblong skull with powerful jaws and wide-spaced eyes.
There are three biological sexes amongst the Altunain.
The idea of three reproductive sexes sounds interesting. I think you could probably expand on that in the anatomy section, to describe them a bit before you drop that idea in the reproduction section. :)