Julia fought alongside Magnus in the Raven’s Roost rebellion and you can’t tell me otherwise.
Alright, just to bring in some fun speculation into the Shiro fandom again. We now know that what a bayard presents as is specific to the paladin, e.g. Lance always having a type of gun regardless if he's using the blue or red bayard, and Keith always has a type of sword. Since the black bayard is technically Shiro's (he fought for it damn it) what do you think it would be if (WHEN) Shiro finally gets to use it? And oh man I am sending in so many questions lately - sorry!