The Sunbird’s Last Lament by Andréa Costello

A runaway princess with botanical magic
A dragon trainer living on borrowed time
A love that transcends their doom

Armed with dark botanical magic, Valenna Castanaia spent her childhood serving as her father’s weapon in a vengeful war — until the day she refused to kill the enemy prince and was forced to flee. Now, with her magic at its most dangerous, she believes nothing can stand in the way of her revenge on her father…until she encounters Evander, the dragon trainer who broke her heart, and she is frustrated to discover that her passion for him has not waned.

Worse still, Evander secretly loves Valenna, but he can’t let her fall for him again because he is plagued by a mysterious magical injury and the elixir he relies on to stay alive is running out — along with his hopes of survival.
With Evander’s life in the balance and Valenna’s magic spiraling out of control, they must find a cure before their pasts catch up to them and they lose one another forever.

The Sunbird’s Last Lament is a poetic, botanical romantasy for anyone who wants to feel yearning, passion, and a cozy sense of encroaching doom.