The Sisters believe they have a holy mission, a task that they have been set by Sigmar himself and to which they must submit themselves body and soul. When the blow finally came, the Sisters gathered beneath the great temple dome of their convent which, well built and fortified as it was by the prayers of the Sisters, protected them from the fire and fury of their master's ire.
Seeress Cassandora foretold the disaster, and at their nightly vigil the Maidens of Sigmar heard the voice of Sigmar speaking in their dreaming minds. Of all the inhabitants of Mordheim, only the Sisters of Sigmar were prepared for its destruction. Even the Grand Theogonist, ostensibly the chief authority over the Order, has cooled towards the Sisterhood, denying the throne to Magritta of Marienburg who was brought up by the Sisters and said to be sympathetic to their cause. Many of Sigmar's priests wish to disband the Order altogether, claiming that women have no right to teach the holy word of Sigmar. Rabble-rousing Witch Hunters have denounced them as witches and driven away by the very peasants they seek to help.
Though once much loved by the common people, the Sisters have seen their popularity wane in recent years. For centuries the nobility of the Empire has sent its wayward or troublesome daughters to the Order of Merciful Sisters of Sigmar, to be initiated into the only Order of priestesses dedicated to the Empire's patron god.