An order created from ancient times, known by few, but for the few who know of it, it is a valuable resource. The guild consist of two main sections, the unblinking eye, and the unforgetting mind.
The unblinking eye consists of rogues, assassins and the like, from all over the world. Their objective is to spy on every major happening and most minor happenings, and gather information, sending it to the nexus of the guild.
The unforgetting mind sect of this guild, consists of scholars, scribes, librarians and magicians, who categorise and store this information in a vast library.
This order has been going from basically the beginning of written history, and they pride themselves on having the most knowledge of any place in the world.
The few lucky people who know of this guild can enter the halls and study information… for a price. People are not allowed to remove a chronical from the library, and the books are magically altered to not be able to pass outside the doors. Those who study within the halls are watched by two guards at all times.
This guild contains many pieces of information an adventurer may want to know - the weakness of a forgotten evil which has re-arisen. Spells and alchemist mixes unknown to the new world, the art of forging metals into new, stronger alloys with innate magical properties, and many more.
Cost for entering the stores alter from person to person, to situation, to purpose to need. It can range from monetary compensation, to quests performed, to limbs removed Anything is possible.