Master smith and Brokkr's brother, forged Mjölnir and Draupnir.

Sindri (Old Norse Sindri, also called Eitri) is a dwarf and master smith who leads the forging when he and his brother Brokkr create three of the gods' most important treasures. In Skáldskaparmál 35, it is Sindri who places the material in the forge and gives instructions, while Brokkr works the bellows.

The three items Sindri forges are the ring Draupnir (which every ninth night drops eight equally heavy rings), the boar Gullinbursti (with golden bristles that shine in the dark), and Thor's hammer Mjölnir. Völuspá 37 also mentions a hall named Sindri in the renewed world after Ragnarok, but the connection to the dwarf is uncertain.

Sources in the Eddas

Skáldskaparmál 35
Sindri leads the forging of Draupnir, Gullinbursti, and Mjölnir while Brokkr works the bellows.
Völuspá 37
A hall named Sindri is mentioned in the renewed world after Ragnarok.

Interpretive traditions

A What we know

Sindri led the forging that created Mjölnir, Draupnir, and Gullinbursti (Skáldskaparmál 35).

A hall named Sindri is mentioned in Völuspá 37.

B What we think we know

Whether the hall Sindri in Völuspá 37 is connected to the dwarf Sindri is debated.

C What we do not know

Sindri's role in myths outside the smithing wager lacks attestation.