[Eddie] cried out but his cry was lost in the golden blast of some tremendous horn. It came from the top of the Tower, and seemed to fill the world. As that note of warning held and drew out over the field where he stood, blackness welled from the windows which girdled the Tower. It overspilled them and spread across the sky in flaggy streams which came together and formed a growing blotch of darkness. It did not look like a cloud; it looked like a tumor hanging over the earth. The sky was blotted out. And, he saw, it was not a cloud or a tumor but a shape, some tenebrous, cyclopean shape racing toward the place where he stood.
Stephen King