At 20th level, the alchemist makes a grand discovery. He immediately learns two normal discoveries, but also learns a third discovery chosen from the list below, representing a truly astounding alchemical breakthrough of significant import. For many alchemists, the promise of one of these grand discoveries is the primary goal of their experiments and hard work.
Awakened Intellect
The alchemist's constant exposure to strange chemicals has expanded his mind. His Intelligence score permanently increases by 2 points.
Eternal Youth
The alchemist has discovered a cure for aging, and from this point forward he takes no penalty to his physical ability scores from advanced age. If the alchemist is already taking such penalties, they are removed at this time.
Fast Healing
The alchemist's flesh responds to damage with shocking speed—he gains fast healing 5.
The alchemist learns how to create a philosopher's stone, and can do so once per month at no cost. Creating a philosopher's stone takes 1 day of work.
Poison Touch
The alchemist gains a poisonous touch, as if under the effects of a poison spell. He can suppress or activate this ability as a free action. The physical appearance of how the alchemist generates and delivers his poisonous touch varies from alchemist to alchemist.
True Mutagen
The alchemist's mutagen now grants a +8 natural armor bonus and a +8 alchemical bonus to Strength, Dexterity, and Constitution. The alchemist takes a –2 penalty to his Intelligence, Wisdom, and Charisma as long as the mutagen persists (see Mutagen). An alchemist must possess the grand mutagen discovery before selecting this discovery.