Dragontail Trials by Daniela R Morassutti

Thea Solenhart is the heir to the throne of Rionis.
And she does not want to rule.

Raised to one day wear the crown, Thea is expected to train as an Emberkeep—a scholar of magic and law, protected behind ancient systems and political order. But while the court debates power and hierarchy, dragons still attack the borders of the island.

Thea doesn’t want strategy.
She wants to fight.

When she enters the academy, one question will decide her future:
Emberkeep—or Dragontail legion?

In a world divided by faction magic and legions, Dragontail warriors are forged in combat and blood, trained to face dragons head-on. They are everything the court make as savages—and everything Thea is drawn to.

Including Lorik Draventh.
From the opposing faction, bound by dangerous magic and darker truths, he is the last person she should trust. And the one she cannot stay away from.
As the Dragontail Trials begin and secrets buried beneath the island start to surface, Thea realizes the greatest danger isn’t wishing for the wrong legion.
It’s discovering that everything she was taught about power, loyalty, and the past may be a lie.