1 Ko Rune + 1 Lem Rune + 1 Perfect Diamond + Exceptional Unique Armor = Elite Version of Armor
and it works only on Ladder and Single Player.
This will upgrade the Gore Rider unique war boots to Gore Rider unique myrmidon greaves. The kick damage will go from 39-80 to 83-149 and the level requirement will go up to 72 and the strength requirement will rise to 156 from 94. Make sure you'll meet the new requirements before doing the upgrade!