The High Fane of Xo was a structure that was located on the planet Nuswatta and the headquarters of the hierophants of Xo, an ancient religious order that practiced ritual sacrifice. It was destroyed by the troops of Xim during Xer VIII's consolidation of power within the Kingdom of Cron and the theocracy was converted to Xer's service.
After the defeat of Xim at the Third Battle of Vontor, the Hutt Empire began a genocidal campaign against the Tionese in the Kiirium Reaches in 24,500 BBY. Fearing imminent destruction, the hierophants fled Nuswatta to found a new stronghold where they would await the climactic battle between Humans and Hutts that they believed would usher in the end of time and the Perfection of Xo. The Tionese never heard from them again.