The rune is required to cast the spell Storm of Armadyl and is made from pure essence and dust of Armadyl, which itself is made from grinding Armadyl shards, dropped only by glacors. Players must bring the component items to the air altar in order to craft the runes. The number of runes per essence is the same as for an air rune, meaning that a minimum of 7 per essence are made due to the level requirement. The rune also resembles an air rune, albeit green.