After The Flash: Dark Zone

How did the world think that when the world relied on power and technology to survive its brutal wars, that it'd survive the Flash? Nuclear fire rained on the world, decimating it, and almost all tech and civilization are gone. The world is dying. Entire continents are glass, burned from almost a thousand nuclear devices. Lakes, and some oceans now do not exist. Mutants wonder the underground caverns, sewers, and ancient bunkers. Above, the bandits, and squabbling remnants of armies and factions wage wars, killing thousands of innocent people in their wake. Most of our weapons are slowly fading, plasma and laser weapons losing power over time, or running out of spare power cells. Some scientists and factions manage to supply themselves with the cells, where many fail. We've reverted to bullets, projectiles, any weapon usable. We try to survive on a dying world. But rumors speak of fortresses where pre-war tech still runs, where humanity can be restored with help of the Dwellers.