With the help of the Salamanders, the xenos were repulsed, and the holy relics they had stolen were recovered. Though they fought valiantly to defend the world, they were on the verge of defeat until an Imperial task force led by the Salamanders arrived to bring relief to the besieged shrine world. The Sisters of the Argent Shroud carried out their assigned duty with diligence for centuries, until Gielia came under attack by Drukhari raiders in 448.M39, in an event known as the Sacking of Gielia. The Sisters also acted as the bodyguards of the planet's ruling Bishops and Cardinals.

These Sisters acted as the guardians of Gielia's sprawling cathedral-cities and holy sites, including the Eternal Flame of Vulkan, a flame which has burned continuously for millennia and according to legend was lit by the Salamanders' Primarch to help the planet's original settlers keep warm. It has been home to an Adepta Sororitas presence since the late 37 th Millennium, when a convent of the Order of the Argent Shroud was established on the planet. The Shrine World of Gielia, located near the border of Segmentum Solar and Segmentum Pacificus, is a cold, inhospitable world, save for a thin band of temperate climate around its equator where virtually all of its population resides.

Order of the flame