After deciding to go to the academy, Ronan allowed Arielle to return to her room. The girl had to take care of the three dragon eggs entrusted to her by Abigail. It was her responsibility and Arielle shouldn't be negligent in doing it. If not her, then who else?
Because the indirect agreement she made with Maxieno was the same thing that had been done to Ronan's family. It was actually no different from a curse. If she didn't complete the task, it was certain that her descendants would be bound to Maxieno and had to complete it until they were successful.
Irene and Aimee also returned to their respective rooms, leaving William who was still in Ronan's study to talk about their other trips, as well as looking for information regarding Thebis.