Dwarves (using the V in the plural seems to have originated with Tolkien) are a human-like race that evolved from maggots that lived on the body of the prehistoric giant, Ymir. They are known to live in great caverns and mines beneath the earth, are expert craftsmen, particularly with metal, and are known for their insatiable greed. Dwarves are still usually friendly with the gods and enemies of the giants. Many of the greatest magical items from Norse mythology, such as Thor's hammer Mjolnir, and the "Battle Boar" Gulinbursti, were manufactured by dwarves.