Universe/Timeline:
Marvel Universe
In the orchards of Krakoa, it was discovered how these five mutants could combine their powers in order to facilitate the resurrection of any mutant who died. Goldballs creates inert spheres of non-viable biological matter; Proteus alters reality to make those spheres into viable "eggs"; an injection of the deceased mutant's preserved DNA is manipulated to bond with the egg by Elixir; Tempus then ages the biological growth rapidly through time manipulation; all held together in perfect synergy by Hope Summers and her interactive mutation.