The Dwarves are an ancient race of skilled forgers and blacksmiths who hail from the realm of Nidavellir ruled by King Eitri. They are close allies of the Asgardians, and after being asked by Odin to create the mighty weapon Mjølnir they forged it for him.
Imir forced the Dwarves to create him a special axe which can match any opponents and break the fabric of reality. When Thor found out what Imir wanted, he battled and defeated him with his lightning strike. After his defeat, he lay on the ground in crisp from Thor's lightning.