| http://www.w3.org/ns/prov#value | - Their nature or appearance are a mystery, but since they are as old as the world, they must have been a part of the [[Music of the Ainur|Ainulindal??]]<ref>[[J.R.R. Tolkien]], [[Christopher Tolkien]] (ed.), ''[[The Silmarillion]]'', [[Ainulindal??]]</ref> or (since Sauron knew them not), a by-product of it.+The [[Balrogs|Balrog]] known as [[Durin's Bane]] learned their tunnels while living in th
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