Aun'El Shi'Ores was an ethereal sent by the Tau to secure and hold the capital of Kronus. He, along with Shas'O Kais, was the leader of the military forces sent by the Tau to protect the colony and bring the wayward planet back into the Tau empire's fold.
During the invasion of Or'es Tash'n, the Ethereal was quickly targeted by enemy forces who sought to deal a harsh blow to Tau morale. Given that the Blood Ravens' ending is the canonical version of events, Aun'el Shi'ores was killed in the assault on Tasn'n, despite being heavily guarded within the Tau citadel and surrounded by his elite bodyguards. His corpse was recovered by an emotionally broken Shas'O Kais before it could be seized by the victorious Space Marines and taken back to T'au for burial as the crumbling Tau forces fled the planet.