Volubilis Potion is a potion that alters the drinker's voice.
To brew this potion, one has to warm the initial mix of ingredients until it turns red, then green. Next, the potion-maker has to add Honeywater until the liquid turns pink. The brew has to be warmed again, this time until it turns orange. When mint sprigs are added, the potion turns into a shade of green. The potion has to be warmed yet again, until it turns blue. Then, more mint sprigs are to be added. By this time the potion should be have turned pink once more. Stewed Mandrake is to be added next, to which the potion turns orange. A small amount of Syrup of Hellebore should be added next, turning the potion blue. To finish the brew, one has to warm the potion until it's red and warm some more until it turns a pleasant yellow. Once finished, the potion should release some sparks.
- Harry Potter and the Half-Blood Prince (video game) (First appearance)