Argh...that's nice stuff...
Mobility penalty though...gragh. And...and...been thinking. If we really are fairly new Exalts...how on Earth would Sil have gotten her hot little mitts on something like that? A magic weapon is small, light, concealable...she could have nicked it from a Dragonborn patrol, or something. But a big heavy suit of armor?
Ngh.
So yeah. I'm rethinking here.
I broaden my call for assistance to just...cool ideas. Not necessarily artifacts, and if artifacts, not necessarily armors. Just something nifty and/or cool that would be of use to the concept.
Concept has evolved! Here's what I'm working with now.
I think the character was originally in a town or city that had been occupied, but not yet fully captured by, the forces of the Realm. The citizens are subject to harsh restrictions. Curfews. Rationing of water and food. Subject to search and seizure of possessions and properties. Etc. Silhouette started out as a lowly thiefly sort, who became kind of a folk hero by stealing food and stuff the Realm took back and secretively distributing/returning it. She Exalted when she was captured and had to bust her way out. After that, she kept up the same biz as before, only more and better. This eventually led to an unanticipated and unwanted consequence. The Realm, tired of the BS and knowing damn well that there was an Anathema loose in that quarter...torched the neighborhood. Made them an example for any who might harbor, support, lend aid or succor to one of the Anathema...and of course a stark message to Sil herself.
Thus she has opted out of the protection biz...not wanting to provoke another reaction like that. Now she's in the vengeance game, though she wants to make it good, so she's not just running in willynilly to get killed. No no, any good second-story gal knows you have to case the joint before you break it. So she's on the move, collecting information about the Realm, the Dragonborn, and their strengths and weaknesses and goals. And, incidentally, growing more powerful herself.
Somewhere in the back of her mind there's a little tally card, with a mark for every innocent life lost to, every injustice committed by, and every insult coming from the Imperial Realm. And one day she means to stand before the Empress...whoever it may be by then...and get some accounting done.
Mwah. Basically, she's more like...Batman now than a ninja. Think of Bruce Wayne when he was training to become Batman. That's Silhouette now. Only with a much more focused goal.
Edit - good lord, she even has a "batarang" as her main weapon. Bahahaa! That armor's looking better now.

What does a Mobility penalty interfere with?