What Wayland (Volund) got up to in his smithy isn’t actually very nice, if you read the ‘Völundarkviða’ Norse poem. It’s a bit gruesome. I’ll leave it up to you whether you tell the kids as they’re poking about amongst the stones. Actually they’ll probably relish it. A little excerpt:
He struck off the heads of those stalwart boys,
Under soot-blackened bellows their bodies hid,
From both their skulls he scraped the hair
And set them in silver as a sight for Nidud,
Of their eyes he fashioned excellent gems
For his dear neighbor, Nidud’s wife,
And out of the teeth which were in their mouths
He forged a brooch to bring Bodvild joy.
You can read the translation by W. H. Auden and P. B. Taylor at ‘Woden’s Harrow – Norse Myth Source Texts’ here
angelfire.com/on/Wodensharrow/volund.html