Su Ming had briefly passed through the Nightmare Dimension while handling matters before, and its corruption and chaos had left a deep impression on him.
The Nightmare Dimension on the DC Universe side had originally been more like a dump, a place where the First Dream, Morpheus, stored certain out-of-control dreams.
Leaving aside the other Multiversal Systems for the moment, Multiverse 1 had been forged by Crisis and possessed an extremely dark nature. As a result, the dreams of creatures living within this cosmic environment were prone to problems as well.
Long, long ago, going mad in one's dreams was nothing unusual. There were always creatures who envisioned bizarre stories and scenes in their dreams, then descended into madness with foolish grins.
These creatures went mad in their dreams and went mad in reality as well, spreading their madness and disorder like an infectious disease. Morpheus created the concept of "Nightmare," separating out a dimension specifically to store this out-of-control garbage.
One of Dream's primary responsibilities was monitoring dreams. What did he monitor? Those dreams that became uncontrollable, distorted, and terrifying.
Whenever such a dream appeared, Dream had to put on his mask, cut away the tumor-like dream, and toss it into "Nightmare" for storage.
Why did Dream's mask look like a gas mask? Probably to avoid being infected by nightmares.
In short, under Dream's care, creatures no longer had nightmares in the true sense. The bad dreams people spoke of nowadays were practically a joke compared to the genuine article from back then.
But later, due to the chaotic and disorderly nature of the Nightmare Dimension, it gradually began attracting certain terrifying beings.
The Old Ones left the Main Dimension and settled there, becoming Background Characters forgotten by mortals.
Their nature ensured that they would not perish. They had