Obsidian Order
From Warhammer 40k - Lexicanum
The Obsidian Order is an Order of the Orders Hospitaller.[1]
It maintains a mission hospice on Alecto, where its sisters deal with a range of maladies, from ocean ague, salt-lung, rad-throat, Uhlren's echo and eyeburn amongst many others. The hospice is ill equipped to deal with the sheer number of diseases and patients they receive.[1]
The sisters typically wear black habits with a mesh veil hung with tiny shards of obsidian, giving them the appearance of crying gleaming black tears and are required to keep their hair short.[1]