Mjolnir
Uru is an Asgardian metal that emits lightining and summons thunderstorms.
Etrie and his dwarven weaponsmiths have created Mjolnir, an enchanted Asgardian battle hammer that possess electrical powers and elemental powers, for Thor, the son of Odin.
The uru metal was later used by Tony Stark to build a new armor to fight Loki, the Uru Armor in The Forge shown and assisted by Etrie. After Thor convinced Etrie, he and his surviving people had created Stormbreaker out from what's left of the uru metal ever since Surtur escaped and burned Nidavellir to the stone. After forging a new hammer, it was given to Beta Ray Bill, the guardian of Skuttlebutt.