Get all the 4 Fade forms. First there's the Mouse which allows you to pass through Mouse Holes and into another Area(You get it in the Raw Fade. Then there's the Burning Man who can pass through Fire Barriers(you gain the form in Burning Tower). Then there is the Spirit who can use the Spirit Doors and other immaterial objects(you gain it at Darkspawn Invasion). At last there is the Golem who can use the Hurl ability to hurl boulders through Massive Doors(you gain the form in Mages Asunder).