"Contains material originally published in magazine form as Legion of X (2022) #6-10 and X-Men: Before the Fall - Sons of X (2023) #1." -- Indicia.

Graphic novel.

"When Judgment Day arrives, Legion is on the Celestial's chopping block! Is David Haller a hero, or will he succumb to his madness just as everyone predicts? Then, something savage is afoot! Nightcrawler develops some very demonic physical features - and he's not the only one. Goodbye, Warren Worthington III - and hello, murderous winged monster! Meanwhile, Banshee has developed a flaming skull, and Cypher and Warlock have made a startling discovery about the seemingly innocuous blooms floating out of the Astral Plane. As Kurt's inner beast threatens to completely take control, can the Legionnaires - with help from the mystical Black Knight - untangle this complex web of threats before it envelops mutantkind? When Legion battles Nimrod, the status quo will be completely shattered!"--Amazon.