In a branch of the Marvel multiverse on Earth-127 there is a variant of Wolverine. Not only does Magneto merge with Wolverine, but also a number of other mutants after a Scarlet Witch variant casts a spell that goes awry. In fact, Magneto becomes so powerful that even an army of Wolverine variants isn’t enough to stop him.
In Exiles #85-86 written by Tony Bedard and Paul Pelletier, a group of Wolverines from a number of different universes are gathering together to stop a multiversal threat. Some of the Wolverines called into action are a zombie Wolverine, the raged-out Weapon X, Days of Future Past Wolverine, Classic Wolverine, and James Howlett as a young boy who just realized he’s a mutant. Those are just a few of the Logans called upon, all for the reason of taking down a version of Magneto who was successful in merging with the version of Wolverine along with other mutants to make himself nearly unstoppable.
Known as Brother Mutant, the nearly unstoppable Magneto variant is an amalgamated being created after a spell to make him more powerful goes wrong. A male Scarlet Witch variant, Scarlet Warlock, attempts to use his magic to heighten Magneto’s powers by merging him with Wolverine, powering up the mutant by introducing magically-fused adamantium to his body along with the other factors of Wolverine that make him an ultra-powerful mutant in his own right. Amid the spell, something goes wrong and every member of this alternate Brotherhood of Mutants melds into one being within Magneto and creates the being known as Brother Mutant.
Everyone that makes up Brother Mutant Magneto, Wolverine, Scarlet Warlock, Quicksilver, and Mesmero. Together, they become Magneto’s most powerful variant not only because of the other mutants involved, but because his powers are enhanced by the adamantium introduced to his body. The collection of separately powerful mutants combined into one being with all their powers increased by the adamantium controlled by Magneto’s consciousness gave birth to Brother Mutant.
Brother Mutant quickly began imposing his great power onto the multiverse which is why the collection of Wolverines was necessary to stop him. Unfortunately, even they weren’t enough to put an end to Brother Mutant’s reign of terror. Eventually, the Exiles, a team of heroes that exist outside of time and space and intervene anywhere they are needed in the multiverse, put an end to the ultra-powered Magneto. While his stint in Marvel Comics is only two issues long, Brother Mutant made a great impression of the entire Marvel multiverse by showing fans Magneto’s most powerful form, one that merged him with Wolverine.
