Fall of X has taken the X-Men books by storm. The Krakoa Era has given readers X-Men stories like they've never experienced, but Fall of X is old school, a mixture of classic X-Men stories like The Fall of The Mutants and Operation: Zero Tolerance. Marvel embracing the past in the X-Men books has benefited the Krakoa Era, despite the era seemingly changing everything about the X-Men.
Source：https://www.cbr.com/best-comics-before-xmen-fall-of-x/
