That would be interference with reality.
Right Hand rewards those humans who show outstanding performance with a pretty nice perk.
Once they pay a certain amount of points, the chosen ones can briefly overclock their brains within the virtual reality space created by the Keystone Core.
After overclocking their brains, whether it's for learning or doing anything else, their performance in reality and individual knowledge levels will significantly increase.
Just like when Chen Yang performed combat training in virtual reality in the past, and when he returned to reality, his combat abilities and cognitive reaction abilities were greatly boosted.
Not to mention things like knowledge.
About the secret of the Keystone Core, Right Hand directly uses the core to hypnotize the subconscious of the chosen ones. As long as they mention the Nightmare World to unrelated people in reality, they will be struck dumb and unable to speak.
