fan fiction Looking for a specific theme

[Steel Accord 6,660]

So I love stories with a particular central theme, overcoming and in fact conquering both existential physical threats but also in a way, cynicism as virtue. See films like Pacific Rim or Independence Day and to a lesser extent The Dark Knight or games like Mass Effect; where overcoming interpersonal grudges is treated as the best possible solution and it's the ruthless, the cynical, and the jaded that are proven to be in the wrong.

 

However, I have a tendency to enjoy settings that are otherwise assertions to the opposite of this viewpoint. So I ask you, for those of you who enjoy things like the New World of Darkness, Warhammer 40K, Shadowrun, A Song of Ice and Fire, can you recommend any fanfics of these or similar properties where an eclectic of erstwhile enemies decide to kick the crap out of their own world's bleakness?