Avengers: Endgame - 20 Things We Learned From The Director's Commentary

6. Thanos' Sword Was Probably Made By Eitri

Avengers Endgame Thanos
Marvel Studios

It's made abundantly clear during Thanos' fight against Captain America that the Mad Titan's Double-Edged Sword is made of an exotic metal not of Earth, given that Thanos uses it to cleave massive chunks out of Cap's Vibranium shield.

Joe Russo coyly remarks, "Well, Thanos clearly knew of Eitri", suggesting that Thanos' blade was created by the King of the Dwarves (Peter Dinklage), who of course helped Thor forge Stormbreaker in Infinity War.

And given that both Markus and McFeely quickly agree with Russo's implication, you can pretty much take it as canon that this is what happened.

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Stay at home dad who spends as much time teaching his kids the merits of Martin Scorsese as possible (against the missus' wishes). General video game, TV and film nut. Occasional sports fan. Full time loon.