In the sky up above, Merlin watched Holy City down below. There were Wizards coming in and out, and it was very lively.
Some were purchasing potion materials while others were studying runology, alchemy, and so on. Elsewhere, there were Wizards cracking their heads to derive new spells, and Wizards who were improving their battle tactics.
Merlin saw that Holy City was a progressive, developing city. This was an accurate reflection of the Saitu Dimension as a whole. The population of Holy City boomed to almost two hundred thousand people, all of them Spell Casters, and was the aptly named "holy city" of the Saitu Dimension.
Although Merlin's Hallucinating spell had achieved its third step, it would be quite difficult to entrap all two hundred thousand people in an illusion, to the point of impossibility. Certainly, any Hallucinating spell would have certain limitations.
However, with the Illusory World, Merlin wanted to try it.