A field of death flowers.
Death Flowers are a mutant plant cultivated by the Carocs for their Pollen-blowers.(Harvest of Doom) The Dark Wizard had made a deal for the Carocs to produce a supply for him, but it's unknown if the Dark Wizard ever received any.
The pollen of the Death Flower makes many races such as humans and Moks fall asleep when they inhale it. It can be used to put them into a trance state afterwards.