Eitri is the king of the Dwarves of
Nidavellir. In his first appearance, he and his brother
Brokk are tasked with creating a spear for
Odin. Due to a young
Loki's magic, the spear is cursed and
Thor is asked to have the dwarves create a new weapon. Loki once again attempts to thwart the dwarves' forging, but they manage to complete the creation of
Mjolnir, along with the boar
Gullinbursti and the golden armband
Draupnir, which they give to Odin. Years later, Loki destroys
Sif's golden hair, leaving her bald. Thor threatens him to replace her hair and meets with Eitri and Brokk. Due to Loki being unable to pay them, the two give Sif black hair as a replacement, which she and Thor do not seem to mind. Odin later visits Eitri to help in forging something for him. In return, Eitri asks that Odin send a female warrior to defeat a rogue dwarf named Throgg. Sif defeats him, and Eitri happily tells her that since Throgg has been bested by a woman, he and the dwarves can now leave peacefully and proceed to begin forging the hammer Stormbreaker for
Beta Ray Bill at Odin's request. Eitri is later visited by Odin and
Balder who wish to stop a fight between Thor and
Eric Masterson. To do this, Eitri creates Thunderstrike, a
mace that evidently becomes Masterson's code name. Due to Loki's magic,
Storm and her team were transported to Asgard and are separated.
Cannonball encounters Eitri in a cave and rescues his family from Throff the Terrible, but is severely injured in the process. For this, Eitri brings him into his home and allows him to heal there, and Eitri's daughter Kindra strikes up a flirtatious relationship with Cannonball. Not long after, Eitri aids Cannonball in fending off
Magma, who is possessed by Dark Elves. After helping her, Loki arrives and threatens Eitri and his kingdom. In response, he uses his magic to help Cannonball and Magma find their friends. Eitri gives Cannonball enchanted armor and a sword as well as a special hammer to give to Loki to expose him. The
New Mutants return to Asgard due to magical influence upon one of them. The dwarves initially mistake them for spies. However, Eitri frees the team and happily greets Cannonball and his friends. They are soon attacked by the
Valkyrior, who are controlled by
Hela. Eitri leads his Dwarves into battle after
Boom Boom insults them. Eitri is captured by Hela and forces him to forge a sword out of the
uru metal by threatening the life of his daughter Kindra. He comforts her by acknowledging the New Mutants' plan of action as well as his own in which the sword has "sown the seeds of Hela's destruction". Eitri frees himself, Kindra, and many of Asgard's warriors from prison and then reveals that he built a flaw in the sword. He has Kindra flee and then strikes the sword, allowing Cannonball to see the flaw and destroy it. Eitri's efforts, along with those of many other Asgardians and the New Mutants, save Odin from death. Shortly before
Ragnarok, Eitri travels with Brokk and Buri to dispose of the forge that was used to create Mjolnir and prevent Loki from using it to create weapons for himself. The attempt ends in disaster, killing all three dwarves. Eitri is resurrected following the events of Ragnarok. In
Thor (vol. 6), Eitri is killed by the God of Hammers during his attack on Nidavellir. ==Powers and abilities==