Mjolnir received several enchantments, all initiated by Odin. The first of them is that no living being can lift the magic hammer unless it is deemed worthy. The hammer returns to the exact point from which it was launched (like a boomerang), usually the hand of Thor himself. Mjolnir helps stave off storms (lightning, thunder, wind and rain) when the user hits the ground twice with the hammer. It can also manipulate the climate, on an almost planetary scale, as when Thor did at the request of Spider-Man to spread a chemical agent across the planet to counter the effects of another chemical developed by the Dr. Octopus and who threatened to totally destroy the ozone layer.
The hammer can open interdimensional portals, allowing Thor to surrender, for example, Earth on Asgard and vice versa. Mjolnir also allowed Thor, at different times, to assume the appearance of the mortal Donald Blake by hitting the ground once with the hammer. In this situation, Mjolnir becomes a walking stick; in this configuration, the enchantment that prevents someone from lifting him from Thor does not work anymore. Finally, the hammer is insensitive to external enchantments. Other enchantments existed before disappearing, like the fact that if Mjolnir remained more than 60 seconds out of Thor’s hand, he regained his mortal appearance if he was out of Asgard (the enchantment was, more later transferred to Stormbreaker from Beta-Ray-Bill).
This faculty reappeared when Thor merged with Eric Masterson. When Thor adopted the appearance of the mortal Jake Olson, his changes of appearance were now triggered by a single punch on a hard surface, Mjolnir disappearing completely, reappearing only when Thor regained his divine appearance. The hammer was also able, for a time, to create temporal distortions, allowing to travel through time but this enchantment was canceled by Immortus with the consent of Thor, manipulated by the Lord of Limbo to believe that this withdrawal was necessary to save the planet Phantus.
Beyond the magic that permeates him, Mjolnir is almost indestructible, resistant to bullets of different caliber, antimatter and heat rays, like those of the Foundry. Known to be able to “destroy the mountains”, Mjolnir is still unable to pierce the adamantium. By twirling Mjolnir fast enough, Thor can create vortices or force fields that can contain an explosion that can destroy a planet. The hammer can also emit energy, and allows the user to control electromagnetism, manipulate molecules, produce energy called “anti-force” (able to counter any other form of energy ) and create “geo-dumps” that can hurt beings such as Ego the Living Planet. More rarely, Thor can use Mjolnir to track a person or mystic objects, to absorb energy – like removing from the Demolishers the powers of Asgardian origin they had acquired – to detect illusions. As an ancient religious and cult artifact, Mjolnir can be used to repel the undead; it is even fatal for vampires – at least the weakest ones – who get burned before falling to ashes as soon as they are hit by the hammer. Mjolnir can also be used to project images. it is even fatal for vampires – at least the weakest ones – who get burned before falling to ashes as soon as they are hit by the hammer. Mjolnir can also be used to project images. it is even fatal for vampires – at least the weakest ones – who get burned before falling to ashes as soon as they are hit by the hammer. Mjolnir can also be used to project images.
However, Mjolnir is not totally indestructible, having been damaged several times: a destructive ray of the Destroyer cut it in two; the Molecule Man vaporized Mjolnir by dissipating the atomic bonds; it was completely broken after channeling an immeasurable amount of energy in order to bring down the Heavenly Exitar; the god Perrikus cut Mjolnir in two with his own magic trick; and, it was destroyed again by hitting the weapons in uru of a group of Storm Giants following Loki during the recent Ragnarok, creating a gigantic explosion. Lately, Mjolnir was again damaged when Thor confronted his grandfather Bor but was repaired mystically thanks to Dr. Strange, who transferred Odin’s power from Thor to the hammer, thus binding the two.