There is an ICE DRAGON!!!
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In the books there are many references to ice dragons. There is also a moment that some have interpreted to mean that a dragon was under Winterfell the whole time and when it is burned, Summer (Bran’s dire wolf) sees it fly off into the sky. But we aren’t; necessarily talking about that. This theory states that there is an ice dragon trapped in the Wall and when the Night King brings the Wall down he will also gain an ice dragon for his army of White Walkers and undead minions.