So what's the deal with all the ice zombies? In short, wights are the undead hordes of soldiers who serve the White Walkers, former humans turned into zombie-like ice monsters that serve under the Night King. The Night King's true motives aren't yet known, but we know that he's extremely powerful and can control the entire army with a sort of telepathy. Fire can destroy the wights, but only dragon fire, dragonglass, and Valyrian steel can kill White Walkers. Samwell Tarly has discovered that Dragonstone, the historical seat of House Targaryen, is sitting on a mountain of dragonglass, and Jon Snow and his men have been mining it and turning it into weapons in preparation ever since. As for the Night King, it's unclear if anything can stop him.  Keep watching the video to know what you should know before watching Game Of Thrones season 8.
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