The Ur-Quan Kohr-Ah are one of the two races of the Ur-Quan species. They share many physical characteristics with their Ur-Quan Kzer-Za bretheren, except that their skin is black instead of green. Their race was genetically engineered by the Dnyarri from the main-line of the Ur-Quan species during the height of their slave empire. The Kohr-Ah were designed to be the "effectors" of the slave empire: the builders and warriors.
The Kohr-Ah species follows the Eternal Doctrine. It states that all non-Ur-Quan species are to be exterminated. The Kohr-Ah are, also, taken with the belief of reincarnation. They believe that by destroying other sentients, cleansing them, they will allow those beings the opportunity to be reborn as Ur-Quan. The Kohr-Ah are thus completely remorseless killers, able to stare down into the eyes of a newborn child and kill him. The vast size of the Kohr-Ah fleet makes them immensely powerful, at the very least the equal of the Ur-Quan Kzer-Za.
Currently, the Kohr-Ah are involved in the Doctrinal Conflict. It is an agreement between themselves and the Kzer-Za, whereby both species move in opposite directions across the galaxy, promoting their doctrine upon the worlds they encounter. When the two races meet, they engage in a war to determine which doctrine becomes ascendent and lays claim to the ancient Sa-Matra, a Precursor Battle Platform of immense power.