Order of the Broken Sepulchre
The Order of the Broken Sepulchre, also known as the Sisters of Death, are a unique Order of the Adepta Sororitas.[1]
The Order is charged with overseeing the Cemetery World of Letum. This Order wears grey robes, has skull tattoos, and practices unfamiliar, unsettling funeral rites such as having lightning strike the coffins of their deceased. All members of the order are young, which is seen as highly suspicious by the rest of the Adepta Sororitas.[1]
Augusta Santorus and her squad became stranded on Letum and interacted with the Order, much to their dismay. Upon investigating Letum, Augusta discovers that the world has a Xenos-derived magnetic field which forces ship to crash on its surface. Further investigations revealed that the Sisters had been sacrificing their young to the fierce storms around Letum for millennia, believing the maelstrom to be a manifestation of the Emperor's power. However Augusta discovers that they are actually worshiping the slumbering beings beneath the surface, revealed to be Necrons. The Sisters above Letum's surface were apparently unaware of the true nature of their sacrifices. Augusta was able to destroy the central Necron obelisk at the center of the underground tomb complex, ending the storms and cycle of sacrifice. In the aftermath the Canoness of the Order vows to undertake a Crusade of penance which would begin by purging Letum of any further xenos taint.[1]