Clarel was the Warden who conscripted Ser Jean-Marc Stroud into the Grey Wardens. Unlike other Grey Warden mages, who join the Order after their Harrowings, Clarel was an enchanter before joining the Grey Wardens.
During the Fifth Blight, she was one of the Orlesian Grey Wardens King Cailan approached for help, but due to the King's death in the Battle of Ostagar and the sealing of the Fereldan borders after that, she was unable to help against the Blight. She always resented that.
After the Blight, she was eager to help the Fereldan Grey Wardens to rebuilt, and tried to negotiate with Arl Teagan of Redcliffe on many occasions, but due the Fereldan mistrust of the Orlesians, and the incident with Warden-Commander Sophia Dryden during the Storm Age, she was again unable to help.
In order to bind the Grey Wardens to his will, Corypheus discovered a way to make every Warden in Orlais hear the Calling. Fearing their deaths and the extinction of their order, the Wardens began to desperately seek allies to help them fulfil their mission of eradicating the darkspawn.
Lord Livius Erimond, a Tevinter magister and Venatori agent, convinced Clarel to use blood magic to raise a demon army, invade the Deep Roads and kill the Old Gods before they wake. Though Clarel reluctantly consented to the human sacrifice necessary for the binding rituals Erimond taught the Grey Wardens, she was unaware that the rituals also enslaved the Wardens to Corypheus. The temptation of ending the Blights proved too great for Clarel, and opposition to her alliance with Erimond was crushed swiftly, sending veteran Wardens into exile for their insubordination.
Learning of Clarel's plans, the reformed Inquisition lay siege to Adamant Fortress just as Clarel begins to summon her demon army. Following a bloody battle, the Inquisitor breaks Erimond's hold over Clarel, who attacks the magister. After this, she commands her wardens to either help or kill the Inquisitor.
Overcome with guilt after realizing the part she played in Corypheus' schemes, Clarel pursues Lord Erimond through Adamant Fortress, overcoming him in battle with ease. Before she strikes the magister down, Clarel is mortally wounded by the dragon under Erimond's control.Her final act is to save the lives of the Inquisitor and their companions by unleashing a huge bolt of energy upon the dragon as it is about to turn on the Herald, injuring the dragon and making it damage part of the bridge as it falls. This causes the Inquisitor and their allies to fall into the Fade.