Estirion (Elvish for star iron) is a lightweight but incredibly hard and sharp metal. The means of making it have been lost. The last to forge estirion weapons was Danthelon Lunitar the Wondersmith. Each estirion sword is priceless in value, worth the cost of entire kingdoms.
Supposedly forged from fallen stars, estirion comes in vibrant hues of black, gray, red, green and blue.
Some elven wise men call estirion the good counterpart to the “evil” dark iron (malirion).