"Reign of X" is a 2020 relaunch of the X-Men line of comic books published by Marvel Comics. It is the sequel to the "Dawn of X" publishing initiative and second phase of the Krakoan Age, which culminated in the limited series "Inferno" and was followed by a sequel relaunch named "Destiny of X".
"Dawn of X" concluded with the crossover event X of Swords, which initiated a sequel relaunch titled "Reign of X" in December 2020. This phase saw the line come together for the Hellfire Gala event, as well as Jonathan Hickman's departure from the line with the miniseries Inferno. "Reign of X" concluded with the twin event series X Lives of Wolverine and X Deaths of Wolverine, during which the majority of the line (aside from X-Men, New Mutants, and Sabretooth) was put on pause. X Lives and X Deaths then served as the foundation of a new relaunch titled "Destiny of X".
When the issues were re-released in trade paperback collections in 2022, this phase was split and renamed into Reign of X and Trials of X. IGN highlighted that "Reign of X showcases Krakoa at the height of its power and influence. Trials of X is about the new and growing threats to Krakoa, as storm clouds begin to gather on the horizon".
Issues marked in bold are marked as red/important in the issue list found in the back of each comic.