They belong to an underrootrace,were almost disappeared,but than they showed up again through the influence of new blood but they will disappear in a fewhundred years.An essence only use a race that long that they need to learn through it and than it will be born again in a new higher race.The race is nothing,only a tool,only a dress for an essence,and after use been thrown away.Races come and go when the mission is done.
More about it in THE BOOK OF LIGHT.