This is an identical method to RuneScape Gold crafting Cosmic Runes. If you've completed Lunar Diplomacy quest you can begin crafting Astral Runes at Altar south-east of the village on the Lunar Isle. Begin by taking Runecrafting Pouch, Earth staff, Law runes and essences. While you run to Altar be aware of 111 combat level Suqahs which could strike you fairly hard if don't ask for...