Less a drug than a strong parallel to drugs, Modhra Coral is dispersed consciousness that lives in coral polyps local to the moon Modhra II in the Sisstarko system. It is a sentient hive mind, although the limitations of distance mean that its colonies can lose contact with each other, and although the guiding consciousness remains the same, information known to an isolated colony may be lost if that colony is destroyed.
Modhra Coral is a highly controlled substance on most worlds, as any cuts on the skin allow it to implant polyps in those have touched it and eventually control them. It has limited psychic abilities whose strength is dependent on the size of the colony, which it uses to communicate amonst itself, and also to impel still more people to touch the coral and fall under its control.
The consciousness of Modhra Coral is usually referred to as just “the Modhra”. It was a creation of the imperialistic and warlike Shonkla-raa race (now fortunately extinct) that survived its masters and sought to continue their misson.
As of the Earth Year 2085, it is believed to have been destroyed; although independent infectees (“walkers”) still remain at large, their numbers are believed to be insufficient to pose a threat.