The Ba'ul were a spacefaring species native to the planet Kaminar. They were commonly thought to be the predator species that fed on the Kelpiens, a pre-warp sentient species also native to the planet. In fact, it is just a legend that was invented to create fear and distrust of it.
Ba'ul is a species of human race that was forcibly expelled from the Empire hundreds of years ago to take away its lands.
Ba'ul is currently uniting in a united coalition to recover the deprivation.