Ash and sand, book 1: Kings of paradise
Richard Nell2017

Ruka, called a demon at birth, is a genius. Born malformed and ugly into the snow-covered wasteland of the Ascom, he was spared from death by his mother's love. Now he is an outcast, consumed with hate for those who've wronged him. But to take his vengeance, he must first survive. Across a vast sea in the white-sand island paradise of Sri Kon, Kale is fourth and youngest son of the Sorcerer King. And at sixteen, Kale is a disappointment. As the first prince ever forced to serve with low-born marines, Kale must prove himself and become a man, or else lose all chance of a worthy future, and any hope to win the love of his life. Though they do not know it, both boys are on the cusp of discovery. Their worlds and lives are destined for greatness, or ruin.

But in a changing world where ash meets paradise, only one man can be king... The first installment of an epic, low- fantasy trilogy. Kings of Paradise is a dark, bloody, coming-of-age story shaped by culture, politics, and magic.