Priscilla is better well off, as a magician, since she ought to already possess a whole variety of skills and spells, and is experienced in using magic. Normally after awakening, a person would need to study and train to be worth much, I'd assume.
I suppose that the Eastern Empire will want to kill her as she is already a Vassal of the Western emperor. Unless the western prince is a shithead and wants to NTR Kian, which he looks like the type to try. Add in the possibly bi/lesbian princess from the Eastern Empire and Kian's got some knifework that needs doing.
Edit: have started re-reading the series, it seems i had it the wrong way around, with Motia bordering the Western empire.
I understand that any Royal wil most probably have a Shadow Troop or something like that, but do they HAVE to copy a ninja for the design? So unimaginative.