Coltari is a deadly poison, used by the Moredhel of Midkemia during their alliance with the Six. It is believed to originate on the world of Kelewan (and carried to Midkemia by Tsurani magicians),
A thin green substance, Coltari is a strong and deadly poison that few beings can withstand. Although the nature of its physical substance is not described, it can be used to envenom weapons, suggesting a viscous liquid. Even Tomas, the reborn Valheru, took several weeks to recover from being shot by such a weapon, and it is surely fatal to any human, elf or dwarf who ingests it.
Related drugs: Joy.