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The Nightmare Phenomenon (also called "Nightmare Phenomena") is a phenomena of strange viruses Nightmares (also called Nightmare Viruses) named after it. that can corrupt not only machines but nature as well, creating weird distortions in the environment. It was created by Gate from a piece of Zero that contained his DNA. Gate intended on using this phenomenon to destroy all lower Reploids to create a utopia with only the strongest ones.
The Nightmare Phenomenon
The Nightmare takes the form of an artificial entity with a small torso and a head with an red eye, and arms who resemble a DNA helix. It will seek any reploids nearby and possess them. When destroyed, they leave behind a blue orb called Nightmare Soul, which will make the Nightmare resurrect if not collected. When affecting an environment, it will make strange objects appear, as well as calling forth unnatural phenomena such as blizzards and acid rains.
Aside from the common Nightmare, there are also the Zero Nightmare, who is a Zero replica made from the Nightmare Phenomenon which possesses the same abilities as the original Zero, and the Nightmare Mother, who is an humongous Nightmare which resembles a protein, controlled by a small mechanic eye.