Nepenthes dulcis is a rather large and rather active carnivorous plant found in the plant conservatory adjacent to Castle Heterodyne's seraglio, where it is rooted in and around the remains of the hanging terrarium it outgrew at some point (presumably during Castle Heterodyne's past two decades of general disrepair). It incapacitates its prey by inducing feelings of great giddiness. Smoke Knights use this somehow, but it isn't clear if the live plant somehow has mental control and they must carry a whole plant with them, or if the effect is gaseous or can otherwise be extracted.