Hull

Hull is a drug, a product that has plagued the Adepts of God for centuries now. Unofficially banned by practically every Order, Hull is a herbal compound of various products that has no recognizable effect on ordinary human beings. But on Adepts, Hull produces a powerful euphoric state and grants a limited psychic-ability to hear the surface thoughts of others.
The Order of Assassins is the only known Order that publicly uses Hull and encourages the practice to other Orders. The senior members of most Orders strongly discourage its use due to the drug's strong addictive quality, and most Regents follow suit, but Hull is still a minor problem among the ranks of the Established Orders.
The purpose of Hull in a story is to give Storytellers and players a chance to tackle the modern issue of drug and alcohol use. What boundaries there are, what you can and cannot take, etc. Hull should never be used in a story to glorify self-abusive behavior.