The Arcane Brotherhood
The Arcane Brotherhood is a league of mages based in the city of Luskan at the fabled Hosttower of the Arcane. The Hosttower is an academy for the best and brightest mages of Faerûn. Only the most promising are accepted as members in the Arcane Brotherhood, and only members of the order can study at the Hosttower.
History
Arklem Greeth, the original Archmage Arcane of the Brotherhood, first appeared in Luskan around 1311 DR. Meticulously building a group of powerful and evil mages, Greeth sought to acquire control of the North by first dominating trade using the far reaching arm of Luskan.
Around the end of 1376 DR, Luskan was invaded by a group of Waterdhavian lords led by Captain Deudermont and Lord Brambleberry. The Brotherhood's presence in Luskan was essentially nullified and a number of wizards killed. Greeth himself fled the city after causing tremendous damage to invading forces.
In 1459 DR the Host Tower was magically rebuilt and the Arcane Brotherhood returned to the city. The wizards quickly gained the trust of the people by clearing undead from the ruins of Illusk, protecting the city from a dragon, and promising to stay out of politics.
Dozens of wizards flocked to Luskan every year to petition to join them, but almost all were rejected immediately. Instead, the Brotherhood grew by recruiting like-minded wizards who would otherwise be rivals or threats to their efforts to continue seeking knowledge and power.