The Kingdom of Skyy
Changelings are shapechangers, a people able to assume the features of other humanoids. Known also as doppelgangers, changeling’s talents breed mistrust and fear, leading many changelings to hide their true nature from even their closest companions. May changelings seek only to avoid unwanted attention and to find a place in the world. Often outlawed from normal society, changelings have integrated quietly into just about every population, where they often assume humble lives wishing to live and be happy just like members of the other races.
Source: Eberron Player’s Guide