The Silversand Triad are a guild of merchants that have risen to dominance politically and financially following the start of the second war of the Western Axis under the leadership of three affluent businessmen called the Exchange Princes. Their base of power is located in the Silversand Exchange that the trio purchased from it's prior owner following the tragedy of the Silversand Massacre. It lies in the center of the Shadaran Wastes, south of the twin cities of the Dominion and just Northwest of Iconium.
Since their purchase of the exchange they grew in market dominance by expanding via a tunnel through the Ivarian Mountains, bridging the two halves of the Western Axis. They have traded in personnel, arms, food, and many other goods since the start of the war and have grown extremely wealthy as a result.
So wealthy, in fact, they were able to organize and support the withdrawl of several cities south of the Eastern Reach from their status as protectorate states of the Dominion of Man. Those cities have since become 'Free Cities' under the protection of the Silversand Triad. In exchange for taxes and free use of their facilities for trade the Tirad offers these cities a Judge of the Peace to organize a direct democracy and protection from Dominion retaliation.