What is the significance of Thorin's key and his map?
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I think thirteen dwarves arrive, they all have different coloured hoods. The key and map was a plan to get in and through the mountain.
There are thirteen dwarves. Dwalin, Balin, Kili, Fili, Dori, Nori, Ori, Oin, Glion, Bifur, Bofur, Bombur, and Thorin.