Empire of Silence by Christopher Ruocchio
Hadrian Marlowe, a man revered as a hero and despised as a murderer, chronicles his tale in the galaxy-spanning debut of the Sun Eater series.
It was not his war.
On the wrong planet, at the right time, for the best reasons, Hadrian Marlowe started down a path that could only end in fire. The galaxy remembers him as a hero: the man who burned every last alien Cielcin from the sky. They remember him as a monster: the devil who destroyed a sun, casually annihilating four billion human lives – even the Emperor himself – against Imperial orders.
But Hadrian was not a hero. He was not a monster. He was not even a soldier.
Fleeing his father and a future as a torturer, Hadrian finds himself stranded on a strange, backwater world. Forced to fight as a gladiator and navigate the intrigues of a foreign planetary court, he will find himself fighting a war he did not start, for an Empire he does not love, against an enemy he will never understand.