Not sure if anyone here ever played the Facebook Dragon Age game, but if you did towards the 'end' of the story quests you ran into a group of Elves known as the Shadow Elves. I tried to search and find more information about them but came up empty. From what I gathered in the game they were just a clan that practiced blood magic with the use of tainted blood. But I honestly do not remember the details.
Can anyone shed more light on them?