Mind rune

Ironman verdict

At least 9 monsters drop it. The easiest is Goblin (level 2, 3/128); the best rate is Ghost (Spirit of Summer) (level 50), at 15/128, about 5.9 per kill. You can also make it yourself: it takes 1 Runecrafting and gives 5.5 Runecrafting XP, using Rune essence. There are 2 other recipes below. Other sources include Essence impling, Essence impling jar, The Barrows Brothers and Ourania Runecrafting Altar, plus 4 more listed below. Making ten takes 10 × Rune essence and gives 55 Runecrafting XP. 9 recipes use Mind rune, including Cracked divination urn (empty), Decorated divination urn (empty) and Exquisite divination urn (empty). Mind 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 3 coins, which is 14 less than the shop price, so buying it to alch does not pay.