[Part of the October 2023 Writathon] Marcus Validus Terno, Commander of the Solarium Marines - First Solar Legion, dies in a nuclear blast attempting to put an end to a war he has been fighting for hundreds of years. Next thing he knows, he has been asked to save a world polluted with nullmana. To do this, he would be reincarnated as what is called a dungeon core, and he would be tasked with saving the few believers that the goddess of the world still has and establishing some kind of foothold to begin the process of regaining the world from those who brought about its end. Throughout this story, Marcus uses everything available to him, from his insane willpower to his knowledge of war, tactics, and weaponry, to struggle against the overwhelming odds of the world of Avardum. Along the way, he finds friends, enemies, and truths that even the Gods will not face.