Vial

Ironman verdict

At least 7 monsters drop it. The easiest is Giant spider (level 2, 2/128); the best rate is Lanzig (level 39), at 50/512, about one every 10 kills. You can also make it yourself: it takes 33 Crafting and gives 35 Crafting XP, using Molten glass. Other sources include Vial pack, Crate of vials and Vial cabinet. Making ten takes 10 × Molten glass and gives 350 Crafting XP. Reaching level 33 Crafting takes 18,247 XP in total; the Crafting calculator counts the actions and materials to any target, and the Crafting guide has the Ironman training route. 18 recipes use Vial, including Anchovy oil, Augmentation dissolver and Black mushroom ink. Vial 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 2 less than the shop price, so buying it to alch does not pay.