Regnum Opus by In The Box is a Amber fragrance for men. This is a new fragrance. Regnum Opus was launched in 2022. Top notes are Almond, Tangerine, Bergamot and Watery Notes; middle notes are Civet, Cardamom, Rose, Geranium, Gardenia and Water Lily; base notes are Agarwood (Oud), Vanilla, Guaiac Wood, Sandalwood, Coffee, Patchouli, Oakmoss, Amber and Pink Pepper.