There were two methods a demon can exist in the material world. One was possession and the other contract. And in both the cases, a medium was always required which would become the anchor of its existence.
So generally, the best method to deal with this was to destroy the anchor, sending the demon back to his realm.
And out of ignorance and lack of information, the group made a horrific discovery.
"It was a parasite of the mind. And before we could learn more about it, it had disappeared in a smoke, leaving us with confusion."
"Which became our biggest mistake of our life."
Maxim recalled the days after the incident. Nothing changed for the Republic of Yethel, just a new leader took seat and things continued to get worse for Wortham principality. Of course, he was never a slave to a country, he was a slave to a belief.
The belief to eradicate the curses and demons that cause suffering through the world. But in that blind faith, he made a mistake. He killed an innocent.