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Here is a look at the X-Men villains who are powerful enough to threaten the entire Marvel Universe, ranked.
6) Brood

The Brood is an alien race that travels through space in search of hosts to infest with their offspring. They look like a mix between the Alien Xenomorphs and the Gremlins, and they are as deadly as either. They are an insectoid species that has terrorized planets across the universe for eons, widely considered in Marvel Comics to be the first galactic predators after arriving from another universe. They have established nests on tens of thousands of worlds and attacked Earth for the first time in Ancient Egypt in 2620 BC. They became enemies of the X-Men when they teamed with Deathbird to try to dispose of Lilandra as ruler of the Shi’ar Empire. When they infect people, they can start to conquer an entire society and are a true threat to the universe.
5) Nimrod

Nimrod comes from one of the X-Men’s darkest storylines, the Days of Future Past timeline. He is one of the most advanced sentient Sentinels ever created and remains powerful, with the sole purpose of hunting down mutants. He then made his way to Earth-616 when he killed Kate Pryde and almost killed Rachel Summers, who escaped to this Earth. Nimrod followed her when he traveled to Earth-61029, killed Storm, and forced Force to build him a time machine, which set him on a mission to eliminate all the mutants on the planet. Nimrod is extremely dangerous. The Days of Future Past timeline revealed the Sentinels killing the Avengers, Fantastic Four, and others, and taking over the world. Nimrod, himself, is a Class Omega villain, more powerful than regular Sentinels.
4) Shadow King

Shadow King is a multiversal villain, meaning he is not restricted to a single Earth and is capable of operating on a scale larger than a single universe, affecting all realities across different timelines and dimensions. This makes him extremely dangerous to everyone, not just the X-Men. Shadow King was allegedly spawned by the first nightmare, with the sole goal of destroying all of existence. Amahl Farouk was a mutant whom the Shadow King bonded with in the present-day Marvel Comics. His only weakness is that he needs a host body to exist in the material world, but when he is there, he is a telepath of the highest order, and he is one of the only true Omega telepaths in existence.











