A Symphony of Shadow and Ash. A Symphony of Shadow and Ash, #1

The Achaemenid Empire is the center of the world, and it is rotting from the inside out. In the shimmering heat of Parsapura, Xerxes II-the King of Kings and the Lion of Parsapura-has become a withered husk of leather and brittle bone. He is dying from the forbidden venom of the Yellow Desert Scorpion, a poison that mimics a natural wasting of the humors to hide the hand of an assassin. As the monarch fades, the sprawling palace of Persepolis transforms into a labyrinth of shadows where every smile hides a dagger and every hallway whispers of treason.
Standing as the final shield against the empire's collapse is Lord Kaveh, the scarred and legendary Commander of the Ten Thousand Immortals. But Kaveh carries a secret that could destroy him faster than any blade: hidden beneath his leather bracer is a spiraling, intricate scar-the mark of forbidden blood-magic. He has spent ten years chaining this power with iron discipline, but as Ardashir, the "Spider of Rhagae, " pulls the strings of a puppet prince and rebel satraps mass their armies like wolves at the borders, Kaveh is forced to choose between the honor of a soldier and the corrupting fire of the Daevas.
To save the realm, Kaveh must forge an uneasy alliance with a beautiful spy forged in the gutters of the harem and a fierce keeper of ancient fire-drakes. Their journey will lead them into the fossilized, organic depths of a pre-Persian ziggurat, where they must retrieve the Astrological Key-a crystalline artifact that unlocks the Archive of Foundations and secrets sealed away for five centuries. As the stars align and the ancient, non-human "Deep Ones" stir from their slumber, Kaveh must undergo the Binding of Ashes.
To protect the world of men, he must sacrifice his own humanity to become a vessel for the fire, fulfilling the prophecy of the Throne of Ash and Fire-becoming the lone guardian walking the razor's edge between a crumbling mortal empire and the eternal void