Military action
Divine Kingdom saw an opportunity. The constant war and conflict in the Old World makes it weak, disorganized and easy prey for outside forces. Their leaders decide to unite the continent under their rule. Those that would bow down, would make vassals, while others would be forced by hand to join. The conflict took over two hundreds of years of constant conflict with Isagorth and Lepidia being the most troublesome to unite. While Isagorth would be wiped off the map, Lepidia surrendered and became a vassal state. The Divine Kingdom didn't allow necromancy but saw no other choice than to let the Ghols live their lives. After the conflict ended, the kingdom would become an Empire, having under its wings nearly 2/3 of the continent.