"A demon is a title," said the Fengye imperiously - nervously. Her hands trembled and her heart thundered but, at the same time, such conduct was unbefitting of the General and so it did not happen. "The occupant is immaterial. A Usurpation leaves a demon with no title, and thus no power. No protection. No form or thought, for its identity has been extracted, rendering it as harmless as a fae in the deepest dream."

Giri, you recognize the words - they're from the Codex of Steel and Salves, an introductory work on Demonology. Not a rare book, not the deep lore of the cosmos, but dangerously accurate and dangerously common. The Codex is the work behind every two bit demonologist or nightmare adept half the world over, and hideously resistant to the Dominion's ability to root it out. A demonologist quoting the Codex usually seeks little more than personal power, some magic trick beyond what ordinary society can provide.

"But I shall not leave you without identity," said Zhaojun, and here that nervousness realigned into confidence, the blue glow behind the stone mask igniting afresh. "I shall give you a new title befitting your new station. I shall grant you the title Maid Confined In Yearning. Accept it, or battle me for mine."

This is not in the Codex.

If the demon so desired, it could fight. It would be the work of years, lurking as powerless as a ghost, waiting for her to perform magic incautiously or die without handing the title to another. A hard road. The offer of a fresh title was practically charity in comparison, although the one she had chosen implied certain changes would be needed...

You don't see a plan here, Giri. There might be one, but if so it's alien to the point of illegibility - which is distinct possibility given that you are dealing with a creature of fate and destiny. But it seems like it's pure spur of the moment impulse and you don't have the foggiest where that might lead.