All of the Ancient Swords except for me and Celestial Severance head towards the top forces in the Mortal Domain, intending to usurp the top forces.
As long as the top forces are under my command, the mid and low-level forces can be easily controlled. I might even find some hidden geniuses or reincarnations from the mid and low-level forces so it is worth it to usurp the top forces.
Fortunately, the representatives of those top forces have offended me so I can use that as an excuse to swallow all of their forces. After I can unite the entire Mortal Domain, I will next unite the entire Immortal Domain until the higher domains.
After all, there might be some hidden geniuses in the lower Domains that have untapped potential so they are worth cultivating to become a powerhouse for my Nation.