Mjolnir

Mjölnir (literally, "that which smashes") is the hammer wielded by Thor, the Norse god of thunder.

Odin, chief of the Norse gods, ordered the dwarfs to forge Mjölnir. The blacksmiths Eitri, Brok, and Buri used the core of a star as the mold. In the process the star exploded and almost took Midgard (Earth) with it; that event may explain the extinction of the dinosaurs, about 65 million years ago. Although powerful in and of itself, the hammer also received several potent spells from Odin, who slew the frost giant Laufey with it. Much later, Mjölnir was bequeathed to Thor, after he proved himself worthy through several trials.

With few exceptions, Thor has carried Mjölnir throughout his adventures. Thus, the history of Mjölnir is the history of Thor. Although Asgard was destroyed in Ragnarok, Thor, and thus the hammer, survived.

After Nick Fury told him an undisclosed secret, he lost his ability of wielding Mjölnir.

• Worthiness Enchantment: This enchantment surrounding Mjölnir prevents it from being wielded by anyone save those who have been found worthy. Thus far, this includes Thor, the Red Norvell, Odin, Beta Ray Bill, and Captain America. To anyone else, Mjölnir cannot be lifted from the ground nor wrested from Thor’s grip. Those who are deemed worthy are able to wield Thor's powers. Captain America said "I've never wielded such limitless power before!"^[7] "It's almost intoxicating!"^[8] As the true master of Mjölnir, Thor can also will unto others the ability to wield the mystical hammer, bypassing the worthiness enchantment, and also empower them with his own godly abilities. As long as he is alive, no one but himself is able to wield the hammer.^[9] The enchantment is so powerful that even with the hammer cut in half, its still in effect.^[10] However, after Nick Fury whispered an unspecified secret to Thor during a fight^[11], Thor not only lost the ability to wield Mjölnir, but the very nature of the enchantment was changed to prevent Thor, the Warriors Three, or Odin himself from lifting it, while allowing the new Thor to pick it up.