Nature rune

Ironman verdict

At least 9 monsters drop it. The easiest is Goblin (level 2, 1/128); the best rate is Giant mole (level 230), at 14/128, about 6.6 per kill. You can also make it yourself: it takes 44 Runecrafting and gives 9 Runecrafting XP, using Pure essence. There is one other recipe below. Other sources include Gnome Restaurant, Aubury, Mystery box (random events) and Ice troll female, plus 4 more listed below. Making ten takes 10 × Pure essence and gives 90 Runecrafting XP. Reaching level 44 Runecrafting takes 55,649 XP in total; the Runecrafting calculator counts the actions and materials to any target, and the Runecrafting guide has the Ironman training route. 34 recipes use Nature rune, including Adamant bar, Banana and Bane bar. Nature rune is available on free-to-play worlds too. 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 74 coins, which is 298 less than the shop price, so buying it to alch does not pay.