The Ultimate Marvel Universe's mark on the main Marvel Universe is still apparent today. It can be found most prominently in the existence of characters such as Miles Morales or the Maker, an alternate, evil version of Reed Richards. But one of the Ultimate Universe's most powerful weapons also crossed over to Earth-616.

Ultimate Mjolnir, the hammer of Ultimate Thor somehow found its way into the ruins of Asgard and empowered several people in its new home. Now, we're taking a closer look at how it got so strong in the first place and how it could factor into the Marvel Cinematic Universe

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The Mjolnir of Earth-1610 is largely similar to Thor's Mjolnir of Earth-616, with a few caveats. For starters, it has the ability to teleport whoever is wielding it. That already gives Thor a massive advantage, but that isn't the only thing separating it from the mainstream Mjolnir. This hammer did not originally possess the worthiness enchantment, which means that anyone could wield the power of Thor, be they, hero or villain. And most importantly, this Mjolnir carried a small piece of Asgard within it, a contingency that would allow for the realm's rebirth in the event Asgard was ever destroyed.

Unfortunately, Earth-1610 was destroyed in Secret Wars, a calamity that affected the entire multiverse, but its Mjolnir survived. It found its way to Earth-616, landing in the ruins of Asgard, with a worthiness enchantment placed upon it. The hammer's presence triggered an arms race that ended with Thor, then going by Odinson, leaving the hammer in Asgard so that no one could wield it.

That isolation didn't last long though. In 2017's Mighty Thor #30, by Jason Aaron, Russell Dauterman and Valerio Schiti, the hammer was soon picked up by Volstagg, who used it to become a new kind of Thor: the War Thor. While the Ultimate Mjolnir granted its wielder the power of Thor, it also overwhelmed them with hate and rage, typically causing them to go on a rampage. The hammer would later be destroyed by Mangog, but this was not the end of its use. Jane Foster used the shards to transform into Thor one last time, resisting its rage-inducing effects to help in the War of the Realms.

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Jane Foster Ultimate Mjolnir

After that battle, shards were still powerful and reforged into a golden vambrace Jane would wear in her duties as Valkyrie. It became known as Undrjarn, an artifact capable of transforming into any weapon Jane could need. This is a versatile skill that's arguably more useful than anything the original Mjolnir can do. With Natalie Portman's Jane Foster confirmed to turn into Thor in the upcoming MCU film Thor: Love and Thunder, the Undrjarn could show up as a weapon for either her or the Odinson to wield.

Even now, there is still no clear answer on why the Ultimate Mjolnir came to Earth-616 or what makes it so powerful. However, the shard of Asgard within might be the answer. To carry Asgard and all of its magic within it, the hammer may be empowered with still-undefined special properties, perhaps explaining its versatility as Undrjarn.

Despite its initial appearance, the Ultimate Mjolnir is not just some carbon copy of Thor's hammer. It is a versatile weapon capable of changing the destiny of anyone in contact with it. In the MCU it could be a devastating weapon and it could be the key to unlocking the next cinematic Thor's power.

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