Eitri is a dwarf and the younger brother of Brokk. In Fall of the Trident he and his brother show the heroes the way into Midgard after they help them reclaim their forge from giants. Later he, along with his brother reforge Thor's hammer, Mjolnir, which was destroyed by Loki, allowing Thor to seal the gate to Tarturus that Kronos is about to escape through.
Eitri is a hero unit who possesses the same resource-gathering abilities as the dwarf unit. He can collect any resource, but is especially efficient at mining gold. Eitri wields a warhammer.