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The Northlander Tribe are traders that deal in furs, dragons and dragon eggs. They live in the Northlands.
As shown in "The Ice Castle", Gobber had some set-tos with the Northlanders, making Gobber distrust them. The Chief of the Northlanders, Arngrim Dammen headed south posing as a fur trader when he heard stories of Berk's Vikings riding dragons. After trading his furs, Dammen stole Stormfly and sailed back to his fortress near Balder Bay. Dammen and his Northlanders then held an auction of dragon eggs such as a Whispering Death one.