|| A potion which does very strange things to you.
|| Potion of Mutation
A surprise in every bottle! Potions of mutation first remove 2-6 mutations, then attempt to inflict 1-3 random mutations on you with each of those mutations having a 60% chance of being good, then give you one good mutation. Heavily mutated characters or those with any form of mutation resistance will often receive fewer mutations, potentially receiving zero. Followers of Zin incur a piety loss and a penance if they knowingly drink this potion.
Note that undead characters cannot mutate and will rot instead, reducing maximum health and possibly taking a temporary hit to stats as well.
Before version 0.20, potions of mutation just attempted to give 1-3 random mutations, with separate potions of beneficial mutation and potions of cure mutation.