Floating within the body of the Light of God Destruction, transformed into a gigantic Core, Yang Yu and his two companions drifted amid the Darkness, connected to the other Cores, supporting the colossal body of the Light of God Destruction.
Because of the effect of the "Despair Breath" black energy, whether it be fairies or humans, all would fall into a dreamscape, where they faced despair over and over again.
The "Despair Breath" was designed with various self-regulating mechanisms to ensure safety, including the gradual escalation of despair and the termination of the experiment when the subject could no longer bear the despair, reverting to the pleasant memories within their mind.
Even if the soldiers didn't pass the test, they wouldn't lose their lives and could still contribute their strength on the battlefield.