[Veronica Mars]

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Originally Posted by Harbinger

Petra and sway are back too? How did that happen?

That's the current storyline in X-Men, every Mutant that's been killed can and/or has been brought back through the Resurrection protocols on Krakoa. The Five create the new body and Xavier imprints the mind of the mutant into the new body.

This article from the Marvel Database explains it better

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Following the foundation of the mutant state of Krakoa, Charles Xavier established a group of mutants known as “the Five” (Tempus, Proteus, Hope Summers, Elixir and Egg) with the goal to resurrect all the fallen mutants in a process that Magneto called “transcendent” in which the five mutants, together, were able to create life by generating biological husks.

During this process of mutant resurrection, Egg produces a number of nonviable biological "eggs," equal to the number of mutants The Five has to resurrect. The eggs are then injected with mutant DNA from Mister Sinister’s genetic catalog, and then made viable thanks to Proteus’ reality-altering powers, transforming the unviable eggs into viable ones. Elixir biologically gives the eggs life starting a new cellular replication process and husk growth, and then Eva Bell uses her time manipulation powers to maturate the husks to the age the mutants were when they died. Hope Summers uses her mimic powers to empower everyone else’s abilities in the process. Hope's powers allowed The Five to operate at both their peak and in unison. With this process, The Five were effectively able to make new clones of the deceased mutants, restoring their bodies, their powers, and their minds as they were at the time of their deaths.