Astral rune

Ironman verdict

At least 9 monsters drop it. The easiest is Skeleton (Tarn's Lair) (level 45, 3/128); the best rate is Dark wizard (The Zamorakian Undercity) (level 114), at 1/12.1, about 1.2 per kill. You can also make it yourself: it takes 40 Runecrafting and gives 8.7 Runecrafting XP, using Pure essence. There is one other recipe below. Other sources include Ourania Runecrafting Altar, Star sprite, New Varrock guard captain and Zombie (New Varrock), plus 4 more listed below. Making ten takes 10 × Pure essence and gives 87 Runecrafting XP. Reaching level 40 Runecrafting takes 37,224 XP in total; the Runecrafting calculator counts the actions and materials to any target, and the Runecrafting guide has the Ironman training route. 135 recipes use Astral rune, including Abyssalbane arrow, Abyssalbane bolts and Admiral pie. It also comes from the Rune shop run (weekly) routine. Astral rune is members-only. It is tradeable on normal accounts, but an Ironman cannot use the Grand Exchange or trade for it, so the sources on this page are the whole list. High Alchemy turns one into 44 coins, which is 176 less than the shop price, so buying it to alch does not pay.