'The Lord of the Rings: The Rings of Power' reveals mithril's origin story

Episode 4 of The Lord of the Rings: The Rings of Power finally reveals what the dwarves of Khazad-dûm have been mining in secret: mithril!

A precious metal invented by J.R.R. Tolkien for his novels, mithril is both incredibly light and impossibly strong. Plus, its beauty never fades. If it sounds familiar, that's because...