Iron Flame

In Iron Flame by Rebecca Yarros, Violet Sorrengail surprises everyone by surviving her grueling first year at the Basgiath War College, but the real test is just beginning. As she transitions into her second year, she faces a brutal new Vice Commandant determined to break her, alongside agonizing physical trials designed to push her fragile body to its absolute limits. Worse still, Violet now carries the devastating, treasonous knowledge of a hidden war that threatens their entire world, forcing her to navigate a web of deadly political secrets and intense emotional strain with her powerful dragon rider commander, Xaden Riorson. With ancient, dark magic gathering outside the college walls and a lethal enemy closing in, Violet must utilize every ounce of her wit, power, and iron will to protect those she loves and survive an impending war that could tear her kingdom apart.

(Book 2, Book 1 is Fourth Wing)