From the introduction:
From Gilgamesh to Infinity War, stories abound of heroes who confront a dark evil that is trying (and succeeding) to undermine the world. All that is good — family bonds, love, support, respect for one another, health and life itself — all of these things are endangered by the darkness.
In Heroic Dark, that Darkness is real. It exists as a malevolent force — sometimes intelligent, sometimes not — that stands as the major threat to the world.
Fortunately, just as in Gilgamesh, there are heroes willing to stand against that darkness. These heroes are ready to fight the good fight, sacrifice what needs to be sacrificed, and take a stand for those things that are good in the world.
Heroic Dark is the story of that fight. Whether it takes place in the 1950s with a ragtag team of Hollywood weirdos fighting McCarthyism, or in a far-flung galaxy at the edge of the universe battling entropy itself, Heroic Dark gives you and your gaming group a toolset for telling the story of an epic heroic conflict between that which destroys, and the individuals trying to stop it. The heroes bravely risk life and limb to fight until the Darkness is finally defeated - or the heroes lose too many battles, and Darkness reigns forever.