Devouring Darkness (Whispers of The Faceless, #1)

Imprisoned in a literal world of demons, Garen, one of the few survivors of a slaughtered village, struggles to survive the cruelty of his demon captors and escape with his life and humanity intact, but when the opportunity presents itself, its cost is dire. Meanwhile, Orlon Rin, a master lightwielder with an immortal body set on hunting the demon responsible for the wave of blood and terror, descends into the demonic world known as The Nightlands accompanied only by his young disciple, Temin.