Conversation so far:
What is Marvel Comics' Legion Quest?
Legion Quest is a six-part Marvel Comics crossover event involving the X-Men, published in 1994-1995. It was a prelude to the Age of Apocalypse extended storyline.
What is Marvel Comics' Age of Apocalypse?
Age of Apocalypse is a 1995 comic book crossover storyline published in the X-Men franchise of books by Marvel Comics.
Who is Magneto?
Magneto is a fictional character appearing in American comic books published by Marvel Comics, commonly in association with the X-Men.

Question: How were Magneto and Xavier opponents?
Self-contained rewrite: How were Magneto and Charles Xavier opponents?