Shilue, if you're good with the idea, doppelganger blood might be a powerful reagent to assist in creating magical items to help with shapeshifting.  That requires Cassandra to have some medical talent in order to draw blood safely, but Vyx might sell her a bit from time to time in order to help with the Veil.<br/><br/>With less than a year, Vyx might have been mostly dedicated to her studies before (since the last one was senior year for her other major), and probably hadn't had a serious amount of time to just get to know people during that point.