After the battle, when I was lost to despair, the Lady Melisandre bid me gaze into the hearthfire. The chimney was drawing strongly, and bits of ash were rising from the fire. I stared at them, feeling half a fool, but she bid me look deeper, and…the ashes were white, rising in the updraft, yet all at once it seemed as if they were falling. Snow, I thought. Then the sparks in the air seemed to circle, to become a ring of torches, and I was looking through the fire down on some high hill in a forest. The cinders had become men in black behind the torches, and there were shapes moving through the snow. For all the heat of the fire, I felt a cold so terrible I shivered, and when I did the sight was gone, the fire but a fire once again. But what I saw was real, I’d stake my kingdom on it.
A Storm of Swords, George R.R. Martin