X-men universe

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You're a character in the X-men universe (you can be a mutant, inhuman, creature, or whatever you'd like), and they're about to go to war with Apocalypse and they need all the help they can get to fight against him and his army. The X-Men, X-Force, New Mutants, and Hellions are gathered together to stop them, and they sent an alrert out to every citizen with some sort of power asking them to help fight alongside them. Every X-Men character exists, and if you want to do a crossover with the Avengers or something, go ahead.