Once the day came to pass, Rosa immediately delivered her end of the deal.
For the sake of a reward and also Rex's spirit body, she decided to help Rex in his endeavor.
Rex wasn't staying for long so Rosa has no qualms with him getting stronger.
More importantly, even if he did have bad intentions, his power wouldn't be enough to resist the might of the Aurelius Noble House. He'd die instantly—as he was still nothing more than an Immortal Spirit, an ant still.
Early in the morning, Rex and the others were picked up.
A royal carriage arrived in front of the carriage and waited for them to come down.
Since Rex had conveyed his urgency, Rosa moved fast—and arranged for him to be escorted as soon as she possibly could. She already mapped the route they were going to go through, located the special Voidal Knights, and arranged for someone to escort Rex.
As this was her house's territory, she practically knew everything above and below this land.