Regin

In Norse mythology, Reginn ([ˈreɣenː]; often anglicized as Regin or Regan) is a son of Hreiðmarr and the foster father of Sigurð.

Reginn gets none of the gold, but he becomes smith to the king and foster father to Sigurð, teaching him many languages as well as sports, chess, and runes.

As the blood touches his tongue, Sigurð understands the speech of birds, who warn him that Reginn intends to kill him.

[4] The Norwegian Þiðreks saga relates a slightly different tale, with Reginn as the dragon and Mimir as his brother and foster father to Sigurð.

Except for the change in name, probably inspired by the Þiðrekssaga, the story of Reginn, Sigurð, and Fáfnir in Siegfried follows closely the text of the Eddas.

[citation needed] Reginn also appears as the main protagonist of Book V in Fire Emblem Heroes, albeit as a female dwarf as opposed to being male.