32. The X-Men vs. Magneto (in the Volcano Base)
The All-New, All-Different X-Men first faced off against Magneto in Uncanny X-Men #104, where he trashed them badly in a manner of seconds before a distraction saved them.
Now, a year later, he showed up again in Uncanny X-Men #112 to finish what he started. He takes the team apart very easily, challenged only by Phoenix, who he is surprised to find such a formidable opponent. Sadly for her, her powers cut out at a bad time, and she is taken in. Wolverine is the last X-Man standing, but that does not last long.
At the end of #112, Magneto has the X-Men captive and he plans to have them held in captivity for the rest of their lives with a robotic Nanny taking care of them (similar, I suppose, to what happened to him when he was reduced to infancy).
Claremont and Byrne continue the story in the next issue where Storm’s pickpocketing experience helps her out as she picks the lock on her chair. When Magneto comes back to the base (which is underneath a volcano in the Antarctic, natch), he discovers that the X-Men are free.
While the first time around, the X-Men tried fighting him one on one (and got beaten easily), this time, Cyclops is coordinating their attacks telepathically through Phoenix, and their hit and run style of attacks are disorientating Magneto enough so that he is having a hard time using his powers.
However, during the battle, the base is damaged, and the lava from the volcano begins to seep in. The X-Men all dash for the exits, with Beast and Jean being the only ones who make it out to the surface alive - or so they think.