Catalyzes the conversion of drimenol to drimendiol, a precursor of the sesquiterpenoid polygodial (PubMed:28258968). Polygodial has been shown to be an antifeedant for a number of herbivorous insects (Probable). (5S,9S,10S)-drim-7-en-11-ol + O2 + reduced [NADPH--hemoprotein reductase] = (5S,10S)-(9R)-7-drimene-11,12-diol + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Belongs to the cytochrome P450 family.