mount gundabad

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Locations of Middle-Earth - Strongholds of the Enemy 

new headcanon:  Azog has sworn to end the line of Durin because of their ancestral claim to the lands he now occupies.  Mount Gundabad was Durin‘s place of awakening, Khazad-dum the kingdom he built.  He’s actively pursuing Thorin because the War of Dwarves and Orcs reminded him of that claim.  In orc terms, if you kill the owner, it’s yours.

Makes a lot more sense than ‘because’