The Rebellious Mountain People had long shown signs of unrest.
Unlike the Redwood Natives, who considered The Empire to be nothing more than a larger tribe and the struggles between them a mere tribal conflict, the Mountain People had a past unified under the faith of the Dragon God and always harbored calls for 'independent nation-building' due to their greater numbers.
These Mountain People believed that the proud descendants of the Dragon God should never be vassals of The Empire; even if they could not gain independence, they should still strive to create a large Mountain People's Autonomous Region akin to the Icebound Fortress Cluster, led by the powerful among their ranks.
They refused to pay taxes to The Empire, living scattered across the forests of the Bison Mountain Range, adhering to ancient traditions and leading lives separate from the rest of the world.