Hello, I'm an expert in mythology and comic lore. When it comes to Thor's Hammer, there are two primary sources to consider: Norse mythology and the Marvel Comics Universe.

In Norse mythology, Thor's hammer is known as Mjölnir. It is said to be made from the metal of a dwarf named Sif, who was turned into a pig and then returned to his original form. The hammer was forged by two dwarf brothers, Brokk and Sindri, using the heart of a dying star, which was dipped into the water of a magical spring, Eitr. This process imbued Mjölnir with its magical properties.

In the Marvel Comics Universe, the composition of Mjölnir is a bit more complex. It is still depicted as being made from a fictional, ultra-dense metal known as Uru, which is found in the heart of a dying star. Uru is described as being magical as well as incredibly durable and strong. The hammer's enchantments are attributed to Odin, Thor's father, who placed a spell on it that allows only those who are deemed worthy to lift it.

So, to answer your question:

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In Marvel continuity, Mjolnir is forged by Dwarven blacksmiths, and is composed of the fictional Asgardian metal uru. The side of the hammer carries the inscription "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor."read more >>