Chapter 631 - The mind control symbol

"Proceed with caution. Before anything try to search for the mental barrier that is triggering the death of those Abyss humans."

"I know the president, but don't know why but the moment I try to use the mind control technique it looks like the trigger got activated on its own. It did not even give me the time to search for the mental barrier that triggered all of this.

It looks like someone put some powerful restriction on their mind and the moment one tries to use the mind control technique to control the mind of those abyss humans, it will immediately trigger the reaction, and the Abyss human will die.