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According to Skáldskaparmál, when Loki had Sif's hair, Freyr's ship Skidbladnir and Odin's spear Gungnir fashioned by the Sons of Ivaldi, he bet his own head with Brokkr that Eitri would not have been able to make items that matched the craftsmanship of those mentioned above.
Eitri began working in his furnace while his brother was working the bellows, but a fly (sometimes thought to be Loki himself) began stinging Brokkr, trying to stop him and spoil the items.
Eitri appears in Jim Butcher's the Dresden Files: Cold Days. as Mr Eitri.
In other media
Eitri occasionally appears as a supporting character in the Marvel Comics, including the "New Mutants Special" released in 1985. He becomes an ally of the titular heroes when a member of their team saves his beloved daughter. He is also a supporting character in the Ultimate Spider-Man episode "Field Trip", where he forges magical weapons for Spider-Man's team to take down Loki in support of Thor.