Okay, just to clarify. Skuld's alloy is nothing specific in myth or fiction -- it's just something light and strong she cooked up for the purposes of the story. As for other mystic metals, well... here's a snippet from DW13 that's going into the Concordance to explain "essential metal":
-- Bob
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...The President is on the line
As ninety-nine crab rangoons go by...
Quote:Skuld's alloy isn't this stuff.
"Different cultures had different names for it: godsteel, uru, adamantium. ... It has all the best properties of all the metals -- the lightness of lithium, the strength of steel and titanium, the corrosion resistance of gold, the conductivity of copper..."
-- Bob
---------
...The President is on the line
As ninety-nine crab rangoons go by...