War doesn't change, just the methods in which they are fought. Voidlight, a method only perceived by God later after he had forced himself to go missing and deemed amongst his children, the Fallen and the Angels that he was dead and only a select few knew of his death which he had faked. Issei discovered his powers on accident and with the help of a undercover God he can harness it

The devil clans post the Civil War in the Underworld lost a Majority of the 72 pillars of the Devil Families, some had gone rogue and others had gone extinct, but one clan, crafty in seing the future and being able to fight their way out escaped the Chaos, Issei, the son of Jiro Vinea raised Issei and now Issei must find his own path like his father had done during the Civil War.

Issei, the one and only caster of void energy, alongside being the red dragon emperor, this made him sought after, by Angels, Fallen and Devil kind alike.

Issei the son of the best swords man, his father the champion of humans who is murdered by the hands of the fallen. Issei takes on a path for revenge with assassination and destruction left in his wake...will those who wronged him be able to stop him?