The Warlords Silent Bride

Princess Diana Valence is the unwanted younger daughter of the South.
She has not spoken properly in seven years.
In the southern court, speech is power. Beauty is currency. Marriage is strategy. Diana has none of the things her father values.
Her elder sister, Princess Calista, is everything Diana is not.
Beautiful. Trained. Graceful. Publicly adored. The daughter princes come to choose.
During a winter alliance banquet meant to secure Calista's marriage, a wounded messenger from the Northern March arrives. He brings a demand from Duke Raigoro Kael of Blackharrow Keep, the Dragon Warlord tasked with defending the empire's monster border.
The old treaty must be honored.
House Valence owes Blackharrow a royal bride.
Everyone assumes Calista will be chosen.
King Odran refuses to surrender his useful daughter.
Instead, he gives Diana.
Diana becomes the bride no prince came to choose.
She is sent north to a war fortress, married to a feared duke, and thrown into a world of soldiers, dragons, monsters, suspicion, and survival.
At first, Diana has no power.
No voice.
No influence.
No place.
But silence has trained her to observe what others miss.
And in Blackharrow, that may become the first useful thing she has ever owned.