DISCLAIMER: I own nothing of Marvel's concepts.
A/N: The title below is the chapter's original name. Sorry for all the summarizing in this book. I worked out the story at school but I couldn't type it until after I got home.
Magneto and Xavier's X-men
A recent Magneto and Xavier's X-Men plot repowered Magneto (the trade off with the druids was they siphon power off of his natural mutation after saving his life/ reviving his corpse, a druid ritual turned Erik into the ultimate alien deterrent), the kid genius that made Magneto's tech so he could pretend he still had his powers turned out to be a mutant. The reveal was made when Vincent physically threatened the boy after introducing him to the X-Men, turns out the boy fears his ability to empower mutants after he accidentally created monsters by empowering the wrong people. Vincent had known about his friend's powers since before they met. Vance had told him not to let the boy use/unlock his powers.
This lead to Vincent impersonating Vance with the military and the boy being taken by the US military for his mind, the whole thing turning into a disaster for both boys when the soldiers turned out to be evil. A common trope for the V twins, I do a pretty good impression of my brother, eh?
In the end V twins, X-Men, Warner (the boy), and Magneto wound up in the Keeper of Reality's chair chambers. Magneto and the X-Men were all near the door, Vance wasn't even surprised to see the Keeper his reaction making it clear he was the reason Vance told Vincent to not let Warner use his powers. The whole huge room was white with a big white chair in the middle. Keeper was at the console in front of the chair. In the end Vincent wound up sitting on the chair after knocking out the Keeper and failing to hack the console before his Inhuman powers made Terrigen mists begin leaking out of him. The chair was Keeper's power source, as Quicksilver who was regularly visiting New York between Attilan crisis informed the returning mutants, Vincent had sacrificed his freedom to maintaining reality as it stands in their universe.