Blood Of Sparta, Flame Of Olympus (Spartan OC X High school DxD)

(moved from @Michael2146)

Over 2000 years ago, Akadios was Sparta's greatest warrior, a demigod forged in battle and tempered by fire. Known as the "Hand of Ares", he led countless campaigns under the war god's banner-not out of devotion, but because war was all he had ever known. Yet despite his brutal reputation, Akadios was not blind to the cruelty of Olympus. When Zeus' affairs resulted in yet another illegitimate child-his sister-Hera executed the newborn out of spite, solidifying Akadios' hatred for the gods.

Ares, recognizing his rage, offered Akadios a path to vengeance, but before he could act, the Olympians deemed him too dangerous to live. Sealed away within a tomb designed to preserve him in his prime, he was erased from history-just another casualty of Olympus' tyranny.

But time did not forget him.

Awakened in the modern era, Akadios finds himself in a world he barely understands. Monsters walk among men, devils rule from the shadows, and Olympus remains as corrupt as ever. Despite his disillusionment with the gods, he finds unlikely allies in Rias Gremory, Sona Sitri, and their peerages, who welcome him as one of their own. With his legendary Spartan arms, the divine sword Riptide, and a repeating crossbow personally forged by Hephaestus, he sets out to carve his own destiny-one not dictated by the whims of gods.

But Olympus has not forgotten him either. And this time, Zeus will fall.