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creature

Gullfaxi

The giant Hrungnir's horse, which races Odin's Sleipnir into Ásgard; after Hrungnir's death Thor gives it to his infant son Magni.

Gullfaxi ("golden mane") is the horse of the giant Hrungnir, and appears in Snorri's telling of Hrungnir's death Skáldskaparmál 17. When Odin rides Sleipnir into Jötunheim, Hrungnir says his own horse Gold-Mane is better paced. The two race, and Hrungnir is so carried away that he does not stop until he is inside the gates of Ásgard.

After the duel, Thor's three-night-old son Magni lifts the dead giant's leg off his father, and Thor rewards him with "the horse Gold-Mane, which Hrungnir possessed". Odin complains that Thor should not give so good a horse to the son of a giantess instead of to his own father Skáldskaparmál 17. Snorri does not say who ended up with it.

The name turns up once more in a verse list of famous horses: "Gullfaxi and Jór with the Gods were" Skáldskaparmál 57. That is everything the sources say about Gullfaxi.

In the sources

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he had a much better paced horse which was called Gold-Mane
Skáldskaparmál 17 Hrungnir boasts that Gullfaxi is better than Odin's horse.
the horse Gold-Mane, which Hrungnir possessed
Skáldskaparmál 17 Thor gives the horse to Magni, and Odin objects.

Myths with Gullfaxi

Thor's duel with Hrungnir A horse race with Odin brings the stone-headed giant Hrungnir drunk and boasting into Asgard. Thor challenges him to the first single combat of his life, kills him with Mjölnir, and carries a piece of the giant's whetstone in his skull for ever after.

Related

Hrungnir The strongest of the giants, with a head, heart and shield of stone. He races Odin into Ásgard, gets drunk there, and dies when Thor's hammer shatters his whetstone and his skull. Sleipnir Odin's grey, eight-legged horse, best of all steeds, foaled by Loki after he lured away the giant builder's stallion Svaðilfari. Odin Óðinn Chief of the Æsir: a one-eyed god of wisdom, poetry, magic, war and the dead, who gave an eye and hanged himself on a tree for knowledge, and who dies at Ragnarök. Thor Þórr The thunder god, strongest of the Æsir: son of Odin and Earth, husband of Sif, and with his hammer Mjöllnir the gods' defender against the giants, until he dies killing the World Serpent. Magni Thor's son by the giantess Járnsaxa. At three nights old he lifted the dead giant Hrungnir's leg off his father; after Ragnarök he and his brother Móði inherit Mjöllnir.