Welcome to Beasts Made of Night by Tochi Onyebuchi, where your sins can be transformed into beasts. In the city of Kos, sin eaters or aki are barely tolerated. Though they cleanse a person of sin by eating it and taking on the guilt of that sin, aki are hated. Used by the mages, whose magic transforms sin into physical beasts that aki kill and eat, aki are worked until the weight of the sins they have eaten crushes them, or a sin beast kills them.
As an aki, Taj knows this will be his fate, but when he eats the sin of Kos’s king and starts working for the palace it might not be the sin eating that kills him. Politics are a new game for Taj and he quickly finds himself hopelessly tangled in a battle between rival mage factions and royals.