Alarms have been sounding in Heaven, Castiel. Alarms that haven't gone off in... ever. We don't even know what they mean.
Those alarms are for The Darkness.
The Darkness is a story.
No, it's not. It's real. The Darkness... it's been locked away since the dawn of creation. And now it's free.
God help us.
I wouldn't count on that.
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