Grand Mutagen

This is a Discovery — a class feature gained through that class's own talent choices, not a feat you pick through normal feat selection.

The alchemist's mutagen now grants a +6 natural armor bonus, a +8 alchemical bonus to one ability score (Strength, Dexterity, or Constitution), a +6 alchemical bonus to a second physical ability score, and a +4 alchemical bonus to a third physical ability score. The alchemist takes a –2 penalty to his Intelligence, Wisdom, and Charisma as long as the mutagen persists (see Mutagen). An alchemist must be at least 16th level and must possess the greater mutagen discovery before selecting this discovery.