The famous sleep-poison of the drow is used on their crossbow bolts to immobilize an enemy so that he can be killed at leisure. The active ingredient comes from the spores of the oloth'arr mushroom, or Lolth's Kiss. While the mushroom itself is fairly common, harvesting the spores is not an effortless chore.
Still, it is common enough to be almost a trademark. The poison attacks the central nervous system, causing the victim to fall asleep. Unlike the magical version, elves are vulnerable to this effect, as it is biological and not magical.
The poison was a black, gummy, and heavy substance like molasses.
DC # [ABL] SAVE or [fall asleep] for [effect duration].
The creature wakes up if it takes damage or if another creature takes an action to shake it awake. <- accurate?