Bifunctional terpene synthase; part of the gene cluster that mediates the biosynthesis of conidiogenone, a diterpene known to induce the conidiation (PubMed:30343633). The bifunctional terpene synthase PrDS converts isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP) into deoxyconidiogenol (PubMed:30343633). The C-terminal prenyltransferase (PT) domain of PrDS catalyzes formation of GGPP, whereas the N-terminal terpene cyclase (TC) domain catalyzes the cyclization of GGPP into deoxyconidiogenol (PubMed:30343633). The cytochrome P450 monooxygenase PrP450 then catalyzes two rounds of oxidation to furnish conidiogenone (PubMed:30343633). (2E,6E)-farnesyl diphosphate + isopentenyl diphosphate = (2E,6E,10E)-geranylgeranyl diphosphate + diphosphate Secondary metabolite biosynthesis; terpenoid biosynthesis. Hexamer. The conserved DDXXD motifs as well as the NSE/DTE motif are important for the catalytic activity, presumably through binding to Mg(2+). In the N-terminal section; belongs to the terpene synthase family. In the C-terminal section; belongs to the FPP/GGPP synthase family.