Taken together, several stanzas from four poems collected in the Poetic Edda refer to Ymir as a primeval being who was born from venom that dripped from the icy rivers Élivágar and lived in the grassless void of Ginnungagap. Ymir birthed a male and female from the pits of his arms, and his legs together begat a six-headed being. The gods Odin, Vili and Vé fashioned the Earth (elsewhere personified as a goddess; Jörð) from his flesh, from his blood the ocean, from his bones the mountains, from his hair the trees, from his brains the clouds, from his skull the heavens, and from his eyebrows the middle realm in which mankind lives, Midgard. In addition, one stanza relates that the dwarfs were given life by the gods from Ymir's flesh and blood (or the Earth and sea).
In the Prose Edda, a narrative is provided that draws from, adds to, and differs from the accounts in the Poetic Edda. According to the Prose Edda, after Ymir was formed from the elemental drops, so too was Auðumbla, a primeval cow, whose milk Ymir fed from. The Prose Edda also states that three gods killed Ymir; the brothers Odin, Vili and Vé, and details that, upon Ymir's death, his blood caused an immense flood. Scholars have debated as to what extent Snorri's account of Ymir is an attempt to synthesize a coherent narrative