The effect of the odd-shaped spray was to make the user appear rational to outsiders, naturally compensating for any inconsistencies in their disguise.
Humans within the Forbidden Zone, already under the control of the restricted area order, began to mutate due to the order.
Generations later, the physical makeup of Forbidden Zone Humans had become completely different from that of normal Humans.
It might be their skin color, hair color, pupils, or they might even have extra limbs.
This made it very difficult for normal Humans to blend in.
However, with the use of the odd-shaped spray, outsiders would overlook these differences, making it a very effective tool for disguise.
But as one of the Taboo Items, its use always came with a cost.
If the spray's effect wasn't removed within a certain period, the user's personality would start to change.
Becoming a whining monster or dead tea, or cases of crawling in the dark on the ground were all too common.