The Grey Sisterhood worhips Prosepina (Ereshkigal), the Lady of Fate. The sisterhood concerns itself with birth and death; and with fate; And wealth, though the latter is not official.
The Fatalines say prayers for the newborn and the recently dead. They charge for these services, though the price varies with the purse of the client.
The Fatalines wear dresses, shawls and veils, all grey in colour, but ranging from ash grey to slate. They usually wear opaque veils in public. A typical Sister wears a woolen habit the colour of rainclouds, with a lighter-coloured veil of linen.
The Greysistren conduct their rites in a dead language so archaic that few people outside their order know its name or where it was originally spoken, much less any part of its grammar or lexicon. The senior Greysistren also use this language to communicate within their order. Furthermore, the order teaches its members a language of hand signals, to be used when silence is warranted.
Most Fatalines do not speak with the living outside of their order. However, there are Saying Sisters, who are tasked with communicating between the order
The Fatalines stand apart from society, being regarded as inviolable, by all but the most depraved of blackguards. They remove themselves from temporal politics, apart from delicately reminding the powers that be of the rights of women, be they daughters, wives or widows. It is customary for all to stand aside for the Greysistren's passage, though they use this privilege carefully.
The Fatalines accept only widows into their order, preferrably those who are without living children, or whom have grown offspring and desire to withdraw from their families. Sometimes an induction into the Greysistren provides a way out for women at uneasy terms with their heirs.
Greysisters are expected to remain celibate. Mostly, the order is monastic, but some sisters are mendicants.
A blessing sometimes granted to pious Fatalines, is the Possible Death, the ability to provoke in others a vision of a possible demise - which may be done as a boon or as a warning. There are also hints and rumours of further blessings, named the Waiting Death and the Certain Death.