Native to the Dominion’s homeworld, Kanta, are the therans, a species of humanoid “reptomammals.” (As with any species classified as reptomammalian, they share traits with both reptiles and mammals). Therans have grey skin and highly flexible, dexterous tails that are segmented and usually a shade of bronze. They have lizard-like eyes but also grow hair on their heads and faces (with very little, if any, elsewhere).

Therans have three hearts. Normally, only one is active, though the other two still beat, just as often and with less strength. When stressed, the secondary heart synchronizes with the first and pumps small amounts of an adrenalin-equivalent into the bloodstream. In very high stress situations, the third synchronizes and releases more adrenalin-equivalent into the bloodstream, while also greatly increasing the rate at which it circulates. If the primary heart should fail, the secondary can take over. And if the secondary fails, the tertiary can take over.

While still inside the body, theran blood is bright purple. But when it exits the body's system of blood vessels (i.e. when bleeding occurs), the blood blackens and congeals, greatly speeding up the clotting process and reducing the risks posed by bleeding.

Their tails are typically slightly over half the length of the individual’s total height and are comprised of a hard, bronze-coloured, chitin-like material arranged in a segmented form. They end in a spear-like tip with sharp edges, which can dull without regular sharpening, and can also be used to enhance balance when necessary. Despite the hardness of the material, theran tails are very flexible and can be contracted and flattened at will. When pressed against the back, the need for special chairs or garments is removed.

Therans also tend to be quite comfortable in high temperatures (up to and including 50 degrees centigrade), but are sensitive to the cold, often experiencing unpleasant sensations starting at temperatures of about 0 degrees centigrade.

Located between the eyes and the bridge of the nose, a small sensory organ rests just under the skin. This organ gives therans the ability to perceive infrared thermal radiation, and acts in addition to the "standard" sensory suite which they also possess (sight, hearing, smell, etc).

Therans are an oviparous species, meaning that females produce eggs which hatch outside the body.

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