Then Taurus brought the mouth of the tube to his lips and blew powerfully. A long jet of yellowish powder shot from the other end of the tube and billowed out instantly in a thick green-yellow cloud that settled over the shrubbery, blotting out the glaring eyes.> - Tower of the Elephant
The black lotus is a much feared, oft-discussed, plant. It is said that the scent of the flowers brings mad, blighted dreams that trouble all but the blackest of souls. The juice of the black lotus is death, an instant plunge into darkness from which one can never recover.
This powder is known to be deadly to animals when blown into their faces, though with the wrong wind, such an attack can prove deadlier to the attacker.