Marvel Fans Have Been Speculating for Seven Years About the Origin of Thanos' Sword That Cut Vibranium

Seven years after the release of 'Avengers: Endgame,' fans are trying to uncover the origin of Thanos' double-edged sword, which he used to shatter Captain America's shield. Marvel has never clarified what the weapon is made of or who forged it.

The discussion was initiated by a user on X with the nickname adeniyialiu007, who attached images of the blade with purple runes to the post. In his message, he wrote: "Are we really going to pretend we don't care where Thanos got this double-edged sword? He sliced through Captain America's vibranium shield like cardboard, blocked full-power lightning strikes from Stormbreaker, and Marvel acted as if he bought it from a cosmic pawn shop. Did Eitri forge it in Nidavellir from uru, or is there a more serious blacksmith in the MCU we haven't seen yet?"

Fan Theories

The most popular theory is uru, the metal of Mjolnir and Stormbreaker. "It must be uru, since the sword is surely enchanted with magic, given how it returns to him. Like Mjolnir," wrote megaosaurus. Others argued: Captain America's shield also returns to its owner without magic, thanks to Steve Rogers' skill in calculating ricochets.

Some fans pointed out that Thanos in 'Endgame' came from 2014: he had years to prepare, and knowledge of the Infinity Gauntlet allowed him to commission a weapon from Eitri. Others noted that vibranium is not as invulnerable as it seems: in 'Black Panther,' it came to Earth with a meteorite, and in the comics, the armor of the Celestials is partially made of it.

"Vibranium dampens vibrations. It's not much stronger than steel, no one claimed otherwise. It just weighs significantly less," explained METRlOS. Fans added that Thanos struck with the edge, and the sword is noticeably thicker than the shield.

Corvus Glaive, who pierced Vision in 'Infinity War,' was also mentioned: the android's body is not entirely made of vibranium, and the blade disrupted his phasing. In Jonathan Hickman's comics, Corvus' weapon cuts atoms. Another theory is adamantium: Tiamut's corpse in 'Eternals,' Oblivion in 'Guardians of the Galaxy,' a scene from 'X-Men 2.'

What is Known

No version has been confirmed: "Marvel has yet to confirm the origin, composition, or creator." Many believe that no explanation is needed: "Thanos is a conqueror of worlds, traveling the galaxy for years. That's enough explanation for me." In the final battle, Scarlet Witch shattered the sword into pieces; whether the fragments remain is unknown.