A Dance of War by Ellie R. Hunter

Twenty-eight years ago, Father Luke received the news that a baby girl had been born into the Camarco family, and a boy into the Marocchi family.
Both on the same night, at the same time.
Two families who had been waging war on each other since arriving in the City of Vita over two hundred years ago.
A war thousands of soldiers have bled and died for. With those births, Father Luke prophesised the children would become the city’s saviours.
They would be raised to despise each other, to continue the feud, but instead would rise together, hand in hand, to wash the blood and violence away.
For love triumphs hate, and there’s always light to overcome the darkness.
However, the people of Vita have given up any hope of peace, as the war has never been worse. The streets are stained with blood, and families are burying their loved ones at an alarming rate.
The fight for control of Vita is far from over.
My name is Jamila Camarco, and my destiny is to destroy Raphael Marocchi. Prophecies, love, and light are nothing but myths, and believing in them will only get you killed.