Svartalf

Svartalf or Svartalves are smiths from the Nevernever

In the Series
In Changes, the summoning ring in Harry Dresden's Lab has been upgraded to a five foot hoop of braided copper, silver, and iron. It cost Harry three grand from a svartaf silversmith. The materials aren't all that expensive the the svartalf needed to be compensated to work with iron. "Each metal strand in the braid was inscribed with sigils and runes in formulae that harnessed and controlled magical energies to a far greater deree than any simple circle. Each strand had its own string of symbols were so tiny and precise that only a svartaf or maybe an Intel could have pulled it off. Flickers of light slithered around each strand of metal, red light, blue and green dancing and intertwining in continuous spirals."