The carrier worms are pale pink worms that have the ability to control minds by entering through the victim's ears and wrapping around their brain. The Shadow Lord created them to replace Grade 3 Ols because they were too "human." The carrier worms were to be used on the Deltoran slaves in the Shadowlands in what was called the Conversion Project.
The Isle of Illusion
The worms had scarlet heads, but were grey for their slimy bodies. They were larger which might have also caused the disabilites.
After many experiments in the workrooms in the Factory, the worms became thinner and faster in process of control.
The carriers can be saved if the worm is removed from the carrier.