In the MCU, Thor started using Stormbreaker since Infinity War.
1. Stormbreaker doesn’t have a `worthy enchantment` like Mjolnir, so anyone can use it
As one of Thor’s power sources, Mjolnir is an artifact enchanted by Odin in the first Thor movie, which is reserved for only those `worthy` to lift this hammer.
It’s different for Stormbreaker, the God of Thunder’s new weapon is not enchanted like Mjolnir.
As Thor mentioned in Infinity War, Nidavellir’s weapon can cause the user’s weak body to break and their mind to go crazy.
In Thor: Love and Thunder, Gorr can also pick up this ax.
2. Stormbreaker can resist energy attacks from the Infinity Gauntlet equipped with enough stones
At the end of Avengers: Infinity War, Thor used the ax Stormbreaker after returning from Nidavellir to turn the tide of the battle.
Interestingly, Stormbreaker can completely withstand attacks from the Infinity Gauntlet, it shows how powerful Thor’s new ax is.
3. Stormbreaker is a weapon that can hurt Thanos
The Russo brothers once said that the Stormbreaker ax was the greatest weapon ever created, and was able to withstand the power of the gauntlet.
4. Eitri calls Stormbreaker the strongest weapon in Asgard
In Infinity War, Eitri calls Stormbreaker the most powerful weapon in Asgard.
5. Can summon Bifrost
Immediately upon completion, Stormbreaker nearly revived Thor to the same extent as Mjolnir and then summoned the Biofrost to accompany him to Wakanda to aid the Avengers.
Stormbreaker’s Bifrost summoning ability will be used by Gorr to achieve Eternity in Love and Thunder.
6. Captain America can summon Stormbreaker
During the final battle in Endgame, there was a moment when Captain America accidentally summoned Stormbreaker instead of Mjolnir.
But soon, Thor and Captain America exchanged weapons.
7. Stormbreaker has emotions
The movie Thor: Love and Thunder showed Stormbreaker seemingly having emotions.