One of the mutants who had been gifted the Genius power, the Biology Genius power more specifically had created a brain, one far more powerful than any natural brain.

The brain was amorphous and didn't resemble any of that on earth, it had roughly the same volume as a human brain but was a lot denser and self sustaining too. 

It didn't have any part of the brain for eyes, ears, taste, or pain receptors.

It could link to any being and take over it's body if given enough time.

It was able to manipulate the physical form of any body it connected to as well, while it's processing power was way beyond that of even a supercomputer, it had the mind of a newborn animal, the only instincts that is was equipped with was survival at all costs, pretty broad.

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More were on their way and would have been finished if not for it taking over the mutant who had created it.

The synthetic brain also was imbued with the purest Knock off elixirs you can get your hands on. Pyrokenesis, Superspeed, inhuman metabolism, super Regeneration, Super strength, and the best of them all, a reanimation one, something that connects to the 'Purple World' and allows the user to reanimate corpses and use them as a vessel, it's a one of a kind, so the brain names Toradox was aptly given the nickname Corpse.

It actually had the tissue of a White Colored Mutant, giving it a resistance to any power that directly affects it.

A strong combination if it says sos itself.