The Lumati are divided into at least two races: the Higher Lumati and the Lower Lumati. At one point the Lumati were one species, however, long term strict segregation has caused a slight evolutionary divergence in the Lumati. Higher Lumati appear to have traits considered by their culture to be "superior"; for example tall stature or psychic ability. Those Lumati born with defects (physical, mental, or even a trait deemed culturally inferior) were relegated to the Lower Lumati. To preserve racial purity, only Higher Luminati bred with other Higher Luminati. The Lower Luminati were not eradicated since the Higher Luminati needed a worker base while they pursued higher ideals. Over time, this has created a symbiotic relationship between the two Lumati races.