"all the novels you read will be incomplete"
...That has to be among the most spiteful curses I have ever heard, pettiness notwithstanding. XD
(Also, I start to see why the Duke was like, "yeah, for starters, you boys should have to struggle a bit to find her"—it doesn't feel like the Prince, at least, has properly stopped to consider whether she'd be interested. I reserve judgement on the rest.)