Egdir is identified in Norse mythology as the watchman of Jötunheimar, home of the Jötnar (or giants) and one of the nine realms in Norse cosmology. He is also believed to have been the herdsman who cared for the offspring of the mythological wolf Fenrir. But he is most well-known for his role in Ragnarok—signaling the Jötnar for the final, epic battle with the strum of his harp.