Warning: spoilers ahead for Death of Doctor Strange: X-Men/Black Knight #1!
In the wake of the Sorcerer Supreme's death, Dane Whitman's Black Knight learns the truth about the MCU's powerful new weapon: the Ebony Blade. Sharing the burden of the cursed sword with his newly reunited daughter Jacks, the two Black Knights respond to a magical attack that has transformed the X-Men into monsters in a new Death of Doctor Strange one-shot. However, Dane also receives a history lesson using the Ebon Siege, discovering the true purpose of the Ebony Blade before the wizard Merlin forged it in the first place.
In Death of Doctor Strange: X-Men/Black Knight #1 from writer Si Spurrier and artist Bob Quinn, the barrier protecting the world from magical threats has broken down now that there is no more Sorcerer Supreme. This has resulted in Europe being invaded by Necromon, the "hungry shade of a dead god," who's transformed and corrupted the X-Men into his monstrous Hungry Court. This leads to a team-up with Jacks as the Black Knight and Faiza Hussain, the current wielder of Excalibur (the legendary sword of King Arthur).
Related: Avengers Reveals Thor's Hidden Link To The Black Knight's Origin
This new one-shot also sees Dane offering support to Jacks from the Ebon Siege, the powerful throne he created from the other Ebony Items forged by Merlin using the Starstone. Granting him supernatural visions, Dane can see into the past, present, and future. As a result, the Siege reveals to Dane the true purpose of the Ebony Blade and the Starstone itself. Remarkably, the Starstone was the stone that Excalibur was pulled from by Arthur. However, it was a dark beacon, drawing all sorts of threats from other dimensions, and only neutralized
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