Gray lotus

The gray lotus is a lotus flower with gray blossoms that grows in the Swamps of the Dead beyond Khitai. The dust of the gray lotus induces homicidal madness in those who breathe it, an irresistable compulsion to kill by whatever means are available, if not with weapons then with bare hands and teeth.

Nabonidus the Red Priest used the gray lotus dust as a trap in his home against those who might seek to harm him, trapping them inside a room and releasing the dust, forcing his enemies to turn on each other. Thak, the ape-man servant of Nabonidus, used the gray lotus trap against a group of nationalistic conspirators who tried to assassinate the Red Priest.