From the introduction:
The Lords of Order cannot normally enter this dimension: the Lords are prevented from entering this dimension by a barrier placed there by Mosses in his secret war against both the Lords of Chaos and Order. However, the Lords of Order and Chaos may still effect change on the Earth. While the physical being that is the Lord of Order cannot enter the Heroes Forever dimension, they can still act through their magical helmets. The Lords of Order are anchored to another dimension and the helmets are the only way they can travel outside that dimension. When a person puts on one of these helmets the Lord takes over that person’s body. This person is called a vassal, the vassal and the Lord come to know each other very well as the Lord is able to know what the vassal knows, however, the vassal doesn’t know what the Lord knows. The vassals are the eyes and ears of the Lords on Earth.