The Blue Mold grows wild on the walls of the derelict parts of London’s underground railway network. It’s slightly luminous, but for the real fun to start, you have to smoke it.
Smoked in a pipe, joint or bong, the Blue Mold is a powerful hallucinogenic that unshackles one’s mind from this reality, and allows it to perceive normally invisible parallel dimensions.
It’s used in the initiatory ceremonies of the mysterious conspiracy known as The Invisibles, and possibly in others of their ceremonies as well. In the world of the Invisibles, not only are the words of the prophets writtten on the subway walls, but the source of all their visions grows there free for anyone to take.