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Age of Apocalypse (Earth-295)[1][]
In this reality, the Decimation was a plan made up by theX-Terminated's scientist, theDr. Moreau, after having heard ofEarth-616'sDecimation via the strike teamX-Force.
Moreau create four clones of theScarlet Witch, intending to haveJean Grey entering her mind to depower theWeapon Omega.
This plan was contraried both byMagneto's anger to see his daughter used in this way, destroying all the clones except forone, and by the attack of Omega's troops. Jean Grey was forced to operate quick, and her actions led to the depoweration of only her and her fellowX-ManSabretooth.
Ultimate Universe (Earth-1610)[2][]
Here a virus was developed by two scientist from theSouth East Asian Republic (SEAR), with low-intensity symptoms, inoculated to several people send to travel, in order to spread it. It function was to prevent the contraction of theX-Gene, which itself originates from a virus, and in essence wipeout the the human mutant genome.
It was the first step ofThe Plan for the SEAR to win the super-human weapons race, the second beingThe Source as the first step of.
"No more powers" (Earth-9021)[3][]
At the end of theHouse of M, theScarlett Witch pronounced the words "No more powers", depowering all powered beings on Earth, includingMutants,Inhumans, mutates, orSkrulls. The only power left was theCosmic Cube.
Peter Parker's granddaughterAnna at some point redeveloped somespider-abilities.
M-Day (Fox film series) (Earth-10005)[4][]
TheM-Day consisted onthis earth of the assault byMagneto'sBrotherhood against the productors of theMutant cure, theWorthington Labs, and the source of it, the mutant-powers suppressorJimmy.
Magneto assaulted theAlcatraz Island where were settled the Worthington Labs complex, using theGolden Gate Bridge as a transport for his followers.
A massive human depoweration and hecatomb happened there, as theU.S. soldiers were equipped with Mutant cure-loaded guns and canons, and as theDark Phoenix rose, killing numerous members of the Brotherhood, including most of theOmega Gang.Magneto himself was depowered, but it was believed that his abilities were slowly coming back.
Age of X (Earth-11326)[5][]
The Decimation was caused by theHuman Coalition's actions afterAlbany, New York,'s destruction by thePhoenix. The mass production ofExonims and the intensive track of mutants and possibleX-Gene carriers grandly diminished the mutant population.
"No More Humans" (Earth-22423)[6][]
At the end of theHouse of M, theScarlet Witch pronounced the words "No more humans", turning every human except for barely ten percent of them into monsters, powered beings or not.
The only seen example isCaptain America, who was turned into aDeathlok and seems to put in application the "No more humans", in killing every normal humans he could.