Skírnir was given the sword Sumarbrander by his master so that the lord of Alfheim may see the giantess Gerd. Skírnir went to Jotunheim by horse to meet Gerd. At some point, the messenger eventually will be attacked by giant wolfs, but the magical Sumarbrander will protect him alone. Skírnir met Gerd in her castle and persuaded her to accepts Frey's marriage proposal. Sometime later, Skírnir pass the sword on to his demigod son Leif Erikson, who would lose it after landing in what would eventually become the city of Boston in Eastern Massachusetts.
- He was the second wielder of Sumarbrander after Frey before giving it to his son.
- His Greco-Roman equivalents Hermes/Mercury in terms of correspondence and pathfinder.
- His name Skírnir means Bright One.
- He was Frey's servant and best friend.
- At some versions of the myth, Skírnir used a mistic item to threaten Gerd to accepts Frey's marriage request. It was called Gambanteinn, which means Magical Wand. It had the power to curse someone's life forever.