Rise of the Twilight Empire
Asmodeus was once an angel, chief servant of a god known only as the Lord of Light. That is, until Asmodeus killed him. For the sacrilege of his betrayal, and perhaps in fear of their own angels, the gods bound him to the Lord of Light’s old realm and forged it into a prison, known as Hell, and cast it into the Abyss. He and his rebel angels, corrupted into devils, have tempted men away from the gods so that they may build their infernal armies so that they may make war on the demons around them and the gods they so despise.