Zevran is an elven assassin who was sent by the Antivian Crows to kill the player in Dragon Age: Origins. Luckily for the player, he had a change of heart and now fights with the Grey Wardens. At least, until the Corws come and find what went wrong.
BioWares next thread in the Dragon Age: Origins tapestry, occurs following the events of Dragon Age: Origins and puts players into the role of a Grey Warden Commander entrusted with rebuilding the order of Grey Wardens.