The effect was instantaneous.
Immediately, Nexus' vision began to blur deliriously. An inordinate sinking feeling of falling backwards suddenly kicked. And his mind came crashing down hard on the bare ground that was reality.
His eyes opened even before his eyes opened. Nexus realized it immediately- he was back. His mind began to aggressively separate reality from illusion. And the room began to gradually come into focus.
Nexus watched askance as the once brilliant kaleidoscopic room plunged into a grim dull orange light. The abundant sounds of laughter that filled his ears were replaced by a ominous resounding silence. The tall glossy marble-like pillars were now replaced by boring slabs of stone.
Mentally, Nexus stirred slowly in the dim light. The brief memory of the illusion began to fade away in the background, as reality slammed right into him unnervingly.
"What. . .in. . .the. . .actual. . .fuck???"
He was lying in his bed.
In his room.