Potion of beneficial mutation

Version 0.19: This article may not be up to date for the latest stable release of Crawl.

Type	Potion
Name	Potion of beneficial mutation
Icon

A potion which gives you a supposedly good mutation.

Quaffing a potion of beneficial mutation immediately gives 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. Beware 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 renders you slightly more vulnerable to silver damage.

Note that ghouls cannot mutate and rot instead, reducing maximum HP and possibly taking a temporary hit to stats as well.

Having the Mutation Resistance mutation causes this potion to fail at least 67% of the time (100% at Rank 3). Additionally, this potion's effect may fail due to sources of mutation resistance that are not from equipment (such as being a halfling) 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, even if Zin (or another source) blocks the mutation.

History

• Prior to 0.16, Zin followers would only lose piety if they gained a mutation.
• Prior to 0.14, Vampires below satiated got rotted by the potion.
• Added in 0.13, replacing the potions of gain strength, dexterity, and intelligence.