Illicit substances are consumables that are outlawed, either for their potential to hurt or for being dangerous in the wrong hands.
The list of illicit substances can be found here under the Controlled Substances Policy or in the Criminal Terminology Act.
Elixirs
There is a group of elixirs called 'shine' elixirs, which are all illicit substances. These can be brewed with the brewer job, and recipes located within the "Book O' Brews"
- Irish Shine Elixir
- Fire Shine Elixir
- Potato Shine Elixir
- Carrot Shine Elixir
- Spirit Shine Elixir
- Glow berry Shine Elixir
- Sweet berry Shine Elixir
Buffs
Buffs were illicit substances that granted positive and/or effects to the user.
These included Quix, Tyalus, Meep, Fuchsin, Hite, Sleepitol, Lerf, Ermiya, Glisp and Azamath. Each substance had distinct effects and specific crafting steps.
If you wished to acquire the base items for each buff, you would venture into the wilderness and break tall grass blocks until you successfully obtained the desired components.