The Blood Skull army is now doing something similar to what the gem people did when they circumvented the normal process of selecting a Sovereign. They are circumventing the process of selecting a new Sovereign by stealing the power of the Sovereign.
The gem people had used a loophole to make the person they wanted to become the next Sovereign, but the Blood Skull army was taking things further by directly stealing the power and the right to pick a new Sovereign from the world.
This is throwing out the selection process entirely and taking control of the strongest power of the realm. So the domain of Ethera will be the true Sovereign. Other Sovereigns will be the fake ones that it appoints to share its power with.
After the Sun King died, all the power that he had released into the world was taken by the domain. This empowered the domain and weakened the sword spirit of Aries. This was why they wanted to kill the Sun King in the domain, not outside of it.
