Yas'tua, a Bothan inhabitant of Korriban, resided there circa 40 ABY. Functioning as part of the Korriban spaceport's ground personnel, he supervised Rak'k and a Human in their duties. Their paths crossed with Alema Rar upon her arrival at the spaceport, at which point Rak'k, disregarding Yas'tua's protests, divulged the whereabouts of the One Sith. Subsequently, Alema commandeered Yas'tua's swoop, intending to utilize it for transportation to the Valley of the Dark Lords.