My urban fantasy novel based on the Norse versions of the story of Sigurd and the Nibelungs is going along pretty well. Recently I've been researching versions of the Sigurd legend (including Wagner's operas) in order to find some context for the changes I'm making. For example, Sigurd's mother's death and his upbringing by a dwarf in the woods comes originally from a German version recorded in the Thidrekssaga.

What I'm interested in finding out is the variations on the Sigurd tradition.

For example, just how different is the German Siegfried from the Norse Sigurd? (The Faroese one is radically different from any of the other versions of the story.) Does Sigurd ever bathe in dragon's blood in the Norse versions? Just how supernatural is Brynhild/Brünhild in the German version?