The Silent Throne

From the publisher:

Beneath the veiled light of a waning crescent, the land of Kaishin lies steeped in shadows, haunted by rumors of treachery and bloodshed. Lord Kurohito, a ruler feared and revered, has been found slain within his fortress, his body marked with signs of sorcery and betrayal. In the wake of his death, a fierce power struggle erupts, as rivals and allies alike vie for control of his shattered legacy. You find yourself thrust into the heart of this turmoil, where loyalty, ambition, and vengeance intertwine with the ghostly murmurs of a lord who may not yet rest.