Summary

• In The Fall of the House of X #3, the ultimate Sentinel and long-time X-Men antagonist, Nimrod, unveils "Sentinel City" as a weapon meant to sterilize Earth of all organic life.
• Nimrod represents an impossible future where mutants and humans alike face total extinction at the hands of malevolent artificial intelligence, posing an existential threat to all flesh-and-blood beings.
• The final act of the Krakoan Era unveils Sentinel City as the ultimate weapon concocted by Orchis' A.I. overlords to achieve their nefarious endgame.

Warning: SPOILERS for The Fall of the House of X #3There are few enemies as synonymous with the X-Men as the mechanized mutant-hunters called the Sentinels. Since the early days of Marvel’s Merry Mutants, these monstrous creations of man have sought the end of their prey. And with the Fall of X reaching a fever pitch, the Sentinels have finally unveiled their secret weapon – and the X-Men’s doom.

The Fall of the House of X #3 – by Gerry Duggan, Lucas Werneck, Jethro Morales, Bryan Valenza, and Travis Lanham – finds Cyclops tracking the ultimate Sentinel, Nimrod, to the Summer House on the Blue Area of the Moon. As Nimrod faces Cyclops and Orchis defector Alia Gregor, Nimrod, reveals the secret of Mercury’s hidden Sentinel City.

After murdering Dr. Gregor, Nimrod gloats, “Sentinel City is not any outpost or mine. It’s a tool to sterilize this hellish planet once and for all.” With this ultimate weapon headed Earth’s way, the X-Men face a greater threat than even they realized.

X-Men Antagonist Nimrod Played A Dangerously Patient Long Game

"Sentinel City" Is Finally Operational

Initially designed to tackle the “mutant problem,” the last few years have made it clear that the Sentinels hold as much contempt for humanity as they do for the X-Men.

Under the best circumstances, such a weapon can hardly go unnoticed, and as such, the Sentinel’s true victory here is the fact that they’ve managed to keep this project under wraps for the majority of the Krakoan Age. As teased back in X-Men #6 – by Jonathan Hickman, Matteo Buffagni, Sunny Gho, and Clayton Cowles – Nimrod acknowledges in this issue that Sentinel City has been hanging over the X-Men like the Sword of Damocles. Now, after Orchis has pitted humanity and mutantkind against one another for so long, it is the perfect opportunity for Sentinel City to strike.

The Sentinels’ ultimate endgame against the mutants has always been total extinction, and with the potential power of the Sentinel City, that goal has never been more attainable. Initially designed to tackle the “mutant problem,” the last few years have made it clear that the Sentinels hold as much contempt for humanity as they do for the X-Men. Should the Sentinel City truly wield the power boasted by Nimrod, it’s an existential threat not just to mutants, but to all life on Earth – and it should make the A.I. ascension all the more possible.

The Krakoan Era's Sentinels Are Far More Than Just X-Men Villains

They Are An Existential Threat To All Life

The Sentinels may have started out as an existential threat for the X-Men alone, but their schemes within Orchis prove that they represent the end of all organic life.

The Sentinels may have started out as Fall of X has been building to for years.

The Fall of the House of X #3 is on sale now from Marvel Comics.