The Last Heirs. The Academy of Last Heirs, #1

The Ashen Empire did not execute the children of the kingdoms it conquered. It sent them to school. At Crownfall Academy, the last heirs of seven destroyed kingdoms are raised behind beautiful walls, polished into diplomats, and taught to thank the empire that ruined their families. The academy promises safety, education, and peace. But beneath its grand towers and glittering halls, something far darker is happening.
Elianor "Eli" Cael, the last heir of the burned mountain kingdom of Arvenstone, arrives at Crownfall believing her people are gone and her future has already been decided. She is expected to study, obey, graduate, and become harmless. Then students begin disappearing. Their rooms are emptied. Their names are removed. Their friends forget they ever existed. When Eli discovers secret messages hidden in the academy walls, she is pulled into a dangerous mystery involving forbidden magic, lost royal bloodlines, imperial lies, and a school designed to turn heirs into prisoners.
With the help of a brilliant drowned princess, a general's conflicted son, and a secret circle of young royals, Eli must uncover what Crownfall is truly hiding before she becomes the next student erased from history. Perfect for readers who love magical academies, royal secrets, dangerous friendships, political fantasy, hidden rebellions, and stories where children of fallen kingdoms rise against the empire that tried to bury them.