Thor's enchanted hammer is named Mjolnir. It is made from a special metal known as Uru, which is known for its durability and ability to absorb and maintain enchantments. The hammer was forged by Eitri and the Dwarves of Nidavellir in the heart of a dying star. It's worth noting that Mjolnir can only be wielded by those who are deemed 'worthy', a testament to its unique and powerful nature.