Uncrowned (The Draonir Saga Book 1) by Sirius
The king is dead.
Long live the king.
Prince Pharun was marked by the gods at birth, yet he has lived his entire life in his younger brother's shadow. Despite becoming Crowned Priest, a right hand to the divine, his father only ever treated him with contempt. Now, the king is dead, and he has named his second son his successor. Pharun is prepared to fight tooth and claw for his birthright, even if that means destroying what little family he has left.
Prince Shrukian has spent his entire life preparing to ascend the throne. When the time comes, he is blindsided by opposition. He never thought that Pharun, the brother he always tried to love, would want to take everything away from him. It hardly seems fair, but Shrukian will not go down without a fight. He will pull on the strings of every foreign and domestic alliance he has, and he is not afraid to challenge the gods.
There is no one to trust in such a perilous game. The one certainty is this; for one king to reign, the other must be uncrowned.