Hax Vostillix was the Hall Master of High Cloud in the Knights Academy during the events of The Winter Knights. He both despised and feared Earth-Scholars, believing them to have been responsible for the near destruction of Sanctaphrax in the past. He also believed that Earth-Scholars were responsible for the brutal, unseasonable winter that chilled Sanctaphrax and threatened to break the Anchor Chain, sending the great floating city into Open Sky, and that the only way to save Sanctaphrax would be to purge the city all Earth-Scholars and Earth-Scholar sympathizers.