The stupid green creatures throwing hand grenades
They could've at least aimed for the Night King, shit was ridiculous
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Only natural as show is winding down
Also did sansa lie to jon to protect littlefinger or is she playing her own game?
Think she didn't want to admit that she tuned down a huge army essentially because of personal feelings, when they're desperately needing any fighters they can get
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Bran is a greenseer, the trees are a network so I assume any tree will do.
Weirdwood trees specifically probably, those with the faces.
There are quite a few still around in the north, and some in other locations in Westeros, often castles and stuff