Tyranny Brought to an Halt — George O. Bancroft

It had been six months since Daug had threatened Armont and two weeks ago Phil and Lou Bender had decided they would visit the city to the west of Barcal. On the way they were met by a man calling himself Daniel Morse. He claimed to be the gatekeeper for the barrier that surrounded the area that had been infected with mutant life.
Morse told Phil and Lou that they had to return home and that they would never be able to go outside of the barrier the World Council had created around the area. That's when Phil contacted Darryl and sent him a copy of the vid he had made during their interview with Morse.
The trio had been through much together. They had faced two powerful predators on Armont - Gyllu and Daug, both somehow controlled by an entity known as The One. Now they found they were prisoners of a body called the World Council, whatever that was.
They needed to find a way through the barrier and confront the World Council. Darryl find the way through the barrier and they group moves into Lommar, only to find that the small rodent have started mutate. It was starting again. Who was behind this change?