Armadyl rune

Armadyl rune is a rune released with the Grandmaster quest, Ritual of the Mahjarrat. It can be crafted with a Runecrafting level of 72 after the quest is completed. The rune is required to cast the spell Storm of Armadyl and is made from Dust of Armadyl (made from grinding Armadyl shards) and pure essence. You must bring the ingredients to the air altar in order to craft these runes. The amount of runes per essence is the same as for an air rune, meaning that a minimum of 7 per essence are made.

Trivia

 * It looks similar to an air rune, but the stripes are green.