This frost-rimed entity was called forth by Ishgardian heretics, with their leader, Lady Iceheart, providing the corporeal vessel into which the spirit of Saint Shiva was imbued. As the first confirmed instance of a primal possessing a mortal host, the summoning was an act of far-reaching political significance that risked supplying the Garleans with further justification for their invasion of Eorzea.
Shiva lived a thousand years ago, an ordinary woman of extraordinary passion who nevertheless lacked the divine nature with which she was later attributed. The deity summoned by the heretics was not the saint herself, but the result of their fanatical worship of her glorified "soul"—the object of their veneration given primal form. Like most Ishgardians, Ysayle and her followers were raised on stories of Halone, the mover of glaciers, and it is theorized that many aspects of the war goddess became entwined with their vision of Shiva and her ice-aspected majesty.