Mutagen

At 1st level, an alchemist discovers how to create a mutagen that he can imbibe in order to heighten his physical prowess at the cost of his personality. It's a standard action to drink a mutagen. Upon being imbibed, the mutagen causes the alchemist to grow bulkier and more bestial, granting him a +2 natural armor bonus and a +4 alchemical bonus to the selected ability score for 10 minutes per alchemist level. In addition, while the mutagen is in effect, the alchemist takes a –2 penalty to one of his mental ability scores. If the mutagen enhances his Strength, it applies a penalty to his Intelligence. If it enhances his Dexterity, it applies a penalty to his Wisdom. If it enhances his Constitution, it applies a penalty to his Charisma.