Behind the Scenes Screenwriters Christopher Markus and Stephen McFeely suggested that because Eitri made both items, he made Stormbreaker to be able to withstand the Infinity Gauntlet.
In a fascinating interview with Collider, Avengers: Infinity War screenwriters Christopher Markus and Stephen McFeely revealed that Thor's new hammer in the film, Stormbreaker, was able to cut through the power of Thanos' Infinity Gauntlet, making it one of the most powerful weapons in the universe.
Stormbreaker and the Infinity Gauntlet were both made by Eitri, allowing the Uru weapon to counter the gauntlet's energy, plus Thor caught Thanos off guard with his nearly decisive attacks, explaining how the God of Thunder was able to overpower the Mad Titan.
Mjolnir has the enchantment where only those who are worthy can wield it, such as Thor or Captain America. Hulk on the other hand, … while Stormbreaker can be wielded by anyone who has the strength to do so (though it can be summoned by those worthy of Mjolnir like Cap did). Case in point, Thanos.
Incredibly, though, Stormbreaker proved capable of resisting the full might of all six Infinity Stones; in the final battle of Avengers: Infinity War, Thanos projected a beam attack against Thor, one that flared with the colors of all six Stones, but Stormbreaker didn't even seem to be slowed by the blast.
We SOLVED Why Stormbreaker Was Able to OVERPOWER The Infinity Gauntlet
Can a Stormbreaker be lifted by anyone?
Unlike Mjølnir, however, the weapon is not enchanted to prevent those deemed "unworthy" from holding it, making anybody with sufficient strength capable of using the weapon.
But as it turns out, it was not just Thor's strength. After all, no weapon in existence should be able to stop the combined power of the Infinity Stones, no matter how powerful the wielder is. Turns out, Thanos was taken unawares. He had just incapacitated all the heroes who tried to stop him.
He was able to lift Stormbreaker because Stormbreaker is purely about strength. In Infinity War, when Thor was asked by the Guardians of the Galaxy, Peter Quill: Don't you think that we should all have a weapon like that?
Stormbreaker has the additional power to summon the Bifröst, allowing Thor to teleport anywhere in the Nine Realms. Screen Rant has identified Stormbreaker as the more powerful of the two, based on this ability, as well as it being a much larger and edged weapon.
Many viewers have pointed out that Thanos was able to lift Stormbreaker without a problem, but this is because the ax isn't enchanted as Mjolnir is. Others believe Thanos lifted Mjolnir (although briefly) and have even argued that he would be worthy of doing so.
The most likely reason is when Groot's arm was separated from him, it became a part of the full weapon and was enchanted to be virtually indestructible. Stormbreaker is a weapon of Nidavellir, which are magical, so it's entirely possible.
If Thor decides to use the power of lightning onboard the Asgardian refugee ship to fight the villain and his minions, he may accidentally damage the ship, or worse, even kill his own people. So, he chose to hold himself back, allowing some Asgardians to escape with Valkyrie (Tessa Thompson) and Korg (Taika Waititi).
Stormbreaker can summon the bifrost and Hela is stronger in Asgard. Thor can teleport her and himself and open her chest killing her, or cut off her limbs ir head. Plus, Stormbreaker is stronger than Mjolnir.
Mjolnir, Thor's primary weapon, is the most easily recognized symbol of the thundering hero. Bestowed with a blessed enchantment, this hammer can only be picked up by those who have been proven worthy of its immense power.
The movie doesn't explain Thor's motivations for giving up Stormbreaker, but it makes sense that Chris Hemsworth simply wanted Love to have a powerful weapon to aid her in battle. It's unlikely that he could give her Mjolnir, considering that so few people in the MCU have been deemed worthy of its power.
While no one besides Thor has been able to truly wield the awesome might of Stormbreaker, Groot was the very first being to hold this weapon when one of his arms became the handle for the mighty axe.
Stormbreaker is able to not only focus, but enhance Thor's abilities. Thor can use the axe to change the weather, summon lightning, and use it as a weapon. Just like Mjolnir, Stormbreaker allows Thor to fly at super speeds and summon it with his hand.
Actually everyone can lift Stormbreaker. Odin's enchantment was only for Mjolnir not for any other weapon which he would use in future. That is why Thanos was able to lift Stormbreaker and he was not worthy of Mjolnir.
When Groot sacrificed himself to save his friends in Guardians of the Galaxy, pieces of him were left behind. They were no longer a part of Groot. The same is true with his arm, which is now just an axe handle, and thus doesn't disappear from existence when Groot does.
