Kingdom of Isles
As old as the Kingdom of Isles itself.
At first just a small group of desperate individuals after the chaos of the magiclysm who made their way by being sneaky and having fast hands. Some say that this was also the origin of the Thieves Guild as well. But certain members soon discovered that even as humanity tried to rebuild itself, greed, jealousy or hate would drive some to pay to be rid of their fellow Islanders.
No one knows for sure how organized, far reaching or effective the brotherhood is, or if they really exist, but their symbol of a wheel with eight daggers, points out pommels toward the middle, strike fear in to the heart of most.
Called Assassins by many and problem solvers by some the midnight brotherhoods methods and motivations make them evil by any account.