Grace, Guns, And A Chevy Impala

"If heaven's grief brings hell's rain, then I'd trade all my tomorrows for just one yesterday."

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Supernatural AU

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The battle is lost. Demons are living on Earth, with no need to have a vessel. One by one, they are killing off humans. Humanity is slowly decreasing, and it's up to a group of four to save them. The ones demons used to fear.

Dean, Sam, Castiel, and Gabriel have been forced to live in the bunker, relying on Cas and Gabe's angel powers to get supplies and food so they can survive.

Y/n is a demon that gets respect from every other demon alive. She is the most dangerous and can't be killed by anything. The most feared being on the planet.

Sam, Dean, Gabe, and Cas must decide: stay in hiding forever, or go outside and defeat Y/n to ultimately save what's left of the Earth. But they were not prepared for what was coming next.