Unseen

The Unseen were a group of shapechangers, illusionists, assassins, thieves and evil creatures based out of Waterdeep. They were led by a greater doppelganger known as Hlaavin, who masqueraded as the Masked Lord, Nindil Jalbuck circa the.

History
The Unseen were originally a group of doppelgangers controlled by illithids, known by that species as a druuth. The mind flayers used them to infiltrate Waterdeep and return intelligence about persons, places, and things of interest to the Underdark city of Ch'Chitl. When the elder brain of that city died in 1362 DR, control of the druuth was lost. One of the doppelgangers, Hlaavin, was secretly a half-illithid and was able to keep the others together to form the Unseen.

Originally based in the Rat Hills, the Rat Hills Conflagration forced the group to abandon their base and flee into the city. They set themselves up in the Hanging Lantern, a high-class brothel that catered to the nobility and the wealthy where they used their abilities to glean secrets from their clientele. This lasted until the famous writer Volothamp Geddarm revealed their ruse. The group spread out after that, creating several bases and outposts in Waterdeep's sewers and Skullport as well as one in the Dungeon of the Crypt.

Several notable setbacks had been documented but only a few of their successes had become known outside of the organization such as the transportation of the creatures known as the wilora into Waterdeep. The rest remained secret such as their inroads into the Arcane Brotherhood, the discovery of the identity of the leader of the Red Sashes and the supplanting of one of Waterdeep's Masked Lords.