Nightwatcher of the Abyss

Hovering above the abyss, the city of Radiance is torn from its peace when a series of sacrificial murders strikes in the dark. Kane Shadowblade, a knight of the Tribunal bearing twin swords, pursues the truth among blood-red runes. Prophecies in crystal, his father's ghost, and fates across countless parallel universes... When the whispers of the Old Ones sound again, he finds himself branded a murderer in everyone's eyes. Silver-haired Alicia stakes her life to glimpse a fragment of the Eternal Eye: "Find him at the Abyss Rift, before everything ends." Will he guard the final light, or plunge into endless darkness? When the mask shatters, only the Nightwatcher stands at the edge of the abyss, awaiting the dawn of redemption. — Description from novelcodex.org