Keepers of Arden: The Brothers, Volume 1 by L.K. Evans

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Over a thousand years have passed since the Long Wars ended and the higher gods abandoned the lands of Arden. Divided and fearful, Arden has managed to secure a restless peace. But peace never lasts. Darkness creeps through the lands once more. Salvarias, a man born of shadow and fire, will become hunted for his magic and a power that can grant a vile god instant victory. Only his brother, Wilhelm, can save him from not only the evil stalking him, but also the darkness that grows within.