Baldr is the shining god of the Aesir, radiant, gracious and so beloved that Snorri says nothing but good can be told of him, the son of Odin and Frigg. When Baldr began to be troubled by dreams foretelling his death, his mother Frigg travelled the world and took an oath from every thing, fire and water, iron and stone, beasts, birds and sickness, that none would harm him. Only the mistletoe, a young plant she thought too small to matter, was passed over. Delighted that nothing could hurt him, the gods made a game of hurling weapons at Baldr and watching them fall harmless. Loki, discovering the one exception, fashioned a dart of mistletoe and guided the hand of Baldr's blind brother Hodr, who threw it and killed him. The death of the best of the gods is the turning point of Norse myth, the first of the calamities that lead toward Ragnarok.
Baldr's death is not told the same way in every medieval source. Saxo Grammaticus, writing his Latin Gesta Danorum around 1200, gives a historicised version in which Baldr and Hodr are rival human warriors, a demigod and a mortal prince, fighting for the hand of a woman named Nanna, with no mention of the mistletoe, the oath-taking or Loki's scheming found in Snorri's later Icelandic account; Hodr kills Baldr in this version with a magic sword rather than a dart. Modern scholars generally treat the two versions as independent branches of a shared older tradition, evidence that the myth of Baldr's death circulated in more than one form even before the Eddas were written down.