The Adrac hail from the planet Arcosia in the Midindus system along the Norma Arm. The planet Arcosia was a large, earth-like planet with a relatively large mantle. This caused violent and active plate tectonics.
Throughout their history, the Adrac hovered between the Red and Blue ranges, resulting in the Scientist Archetype. What is considered a very stupid move on the part of the population the switched to the Zealot Archetype. They have plans to change back.