Potion of beneficial mutation
|A potion which gives you a supposedly good mutation.|
Quaffing a potion of beneficial mutation will immediately give you a single mutation from the list of good mutations. This can include a boost to one of your stats, free resistances, and many more things that are (usually) helpful. Be aware that some good mutations come with negative aspects, that piles of good mutations may make curing bad mutations much more difficult, and that each mutation you add on will render you slightly more vulnerable to silver ammunition.
Note that ghouls cannot mutate and will rot instead, reducing maximum HP and possibly taking a temporary hit to stats as well. Vampires can benefit from these potions, but only if their hunger level is Satiated or better; otherwise they rot as well.
This potion's effect is not blocked by an amulet of mutation resistance, but it may fail due to other sources of mutation resistance or physiological conflicts (attempting to give nagas talons or tengu fangs, for example). Followers of Zin lose 10 piety if they knowingly drink this potion and Zin doesn't block the mutation.