Crusaders and Marauders
Very little is known about the Assassin’s Guild.
The Guild gives a book called The Black Book to young inductees. The book is written in a complicated cipher. It details appropriate tactics and strategy to be employed by assassins. (Imagine Sun Tzu’s “Art of War” if it were written from the viewpoint of a genius assassination master.)
The Assassin cipher is used for most written communication between Guild and members.
The Guild occasionally purchases orphan children or infants to train as assassins from birth.
Members of the Guild are taught to worship the Raven Queen.
Members of the Guild are well-taken-care-of.
However, members are not free to break their affiliation with the Guild for any reason. Consequences for doing so are obvious.