The process of divination is a bloody habit for the Sisters of the Veil, which assassinate children in order to satisfy their god. This is seen as a natural order, and the targets are chosen carefully. They are never involved in political battles, and the children they steal for their rituals are apparently chosen randomly, but this is far from the truth.
The sisters treat their victims with respect, as it is a great honor to die as a sacrifice for this god. Each sacrificed child means that another Phantom Assassin can take the place of other assassin. Nobody even knows how the Outworld Devourer is connected with the Sisters of the veil, but even the sisters are sometimes whispering her name with fear: Mortred, the Phantom Assassin, the only creature that can scare what is under the Veil.