Hilary is an archon serving Charlescomm. In the Battle for Jetstone, she and five others (Brittany, Miley, Paris, Avril, and Lindsay) were dispatched to spy on Haggar's column and to report their findings back to the capital, while Arkendish communications were blacked out.
It was a dangerous assignment, and when their veil was blown upon the start of Haggar's turn, three of the archons were croaked. Seeing her partner fall to archery, she flew to the ground and surrendered. She was tortured by Prince Sammy and his retinue, sustaining a broken leg, injured eye, and other sundry harm, while not revealing anything about her mission or Charlie's plans (but offering to sell the information), before Charlie contacted her and used her to "negotiate" with Sammy.