The explanation within the Silver Chip made Ian realize, "So that's how it is."
Now it was much easier to explain.
Just as the Lost Souls within Ian had shown, after Adalbert destroyed the restraining devices, all the Lost Souls within the Avak Domain had scattered across the land, waiting for someone to avenge them or save them and help them leave this region.
Ian and Adalbert avenged them by annihilating Fiery Flame Land, the Spirit Wisdom Institute, and all the researchers in Duke Sorin's Domain, thus they became two Deceased Monarchs, but that didn't mean the others' efforts in the battle within the Avak Domain were discounted.
The Frost Butterfly, for instance, who helped Ian defeat the Nightmare Spawn and Viscount Awak, was also fairly granted a portion of power by the impartial Lost Souls.
If the Frost Butterfly had Spirit Energy Potential, she would be able to receive a portion of the Deceased Monarch's power.