The Giant's Causeway Ring from Banshee Silver.
Fionn MacCumhaill, under the guardianship of poet Finn Eces, was ordered to cook a salmon, and while turning it, burnt his thumb. By sucking his thumb he inadvertently ate from the salmon of knowledge “bradán feasa” which fed from the sacred pool surrounded by nine hazels. In this way, he gained his extraordinary wisdom and power and famously created the Giant’s Causeway by ripping rocks from the earth and throwing them across the Irish sea to make a causeway to Scotland to conquer the Scottish giant Benandonner.