The Dragon of Frost was killed.
The guardian dragon that had lived in the north of the empire was under the attack of the forces of the religion for a long while, but they couldn't win against the dragon. That was until the head of the religion, the man calling himself the holy saint, stepped up and murdered the dragon.
That was the trigger of the disaster that descended upon that land, upon that once glorious empire.
The northern part of the empire was reduced to dust. No, actually, it was reduced to nothing but ice. The lands, the mountains that were once home to hundreds of people were now barren, covered in layers of snow and ice. The dragon had released its anger on the innocent people of the land, turning the area into a cold tomb for its body.