What appears to be a foul smelling olive oil, is actually one of the Grand Enchantments of the Alchemical craft. It is an alchemical tool used to make flesh as moldable and mergable as clay.
A potion of great strength, it is a finely brewed tea that restores Constitution, as well as gives the drinker an unusual burst of Strength, due to the high levels of caffine. Tastes great chilled and with a drop of honey and lemon.
Itching dust makes someone or something itch. It is very distracting and only gets worse until the dust wears out or an antidote is applied.
With regard to the plot "Sleeping Mines of Elathon":
You manage to get the water wheel in the mine working which operates a pump to clear the flooded lower levels. As you explore the dank tunnels of the lower galleries, you can hear the creaking of the wheel above. You enter a low-ceilinged passage and are crawling on your backs, when the creaking stops. The water starts seeping wetly around the back of your head...