If Cassandra is a Templar, I'm making a headcannon that my mage Inquisitor discovers a spell that, while not freeing her from a dependence on lyrium, allows him to mimics the effects for her. This makes it less of a crisis when she runs out of lyrium out in the field.
Also allows for a fanfiction where they are stranded on a desert island and Cassandra is slowly going crazy. This is when the Inquisitor figures it out. but not before Cass lets a few blackmail-worthy bits of info out.
"Cassandra, you mentioned someone on that island, while you were delirious. A guy named ...uh...what was it....Gaylon? Regaylon? Something like that? Said you wanted to jump him like a werewolf jumps a halla?"