As Xael'Tor released his Zone, an area of around five hundred kilometres was immediately engulfed by dark Eldritch Energy.
Evan was caught inside the Eldritch Energy Zone and felt his power drop by nearly 40%. At the same time, strange ghastly figures moved within Xael'Tor's Zone, making eerie sounds that affected Evan's perception and mind, making it difficult for him to focus.
When a person creates their Illusionary World and becomes a Rank Three Core Evolver, the power of their Zone is amplified at least two times under the effect of the Illusionary World.
This effect can be even greater depending on the quality of the Zone and the kind of Illusionary World that was created by the core evolver.
However, the primary purpose of the Illusionary World is not to amplify the power of the Zone but to increase the energy recovery speed of the core evolvers while providing them with a huge reserve of energy.