Mjolnir (or Mjollnir) was forged by the dwarf-smiths Brokk and Eitri, the sons of Sindri.

In game terms (and in Thorr’s hands) the weapon is +5 doing 10-100 hit points of damage per hit. It can be thrown 200 yards and will return to wielder in one round, clapping with stunning thunder when it hits. The hammer can also cast lightning bolts at any target within sight. It requires a strength score higher than 25 to wield the weapon.