Hreven Karsh was a member of the warrior caste of the Yuuzhan Vong, and during the Yuuzhan Vong War was escalated to the position of commander following the death of his relative, Supreme Commander Komm Karsh. Hreven Karsh later accompanied another supreme commander, B'shith Vorrik, during the campaign to crush the Imperial Remnant, but was later ordered to remain in the Unknown Regions to hunt a party of Jedi searching for the living planet of Zonama Sekot. When he failed in this capacity, Karsh returned to Coruscant, where he was reprimanded and sent by Supreme Overlord Shimrra Jamaane on a suicide mission to invade the Chiss Ascendancy.