From the International Journal of Human Potential Development, this pic represents the Greater Cognatogen.

Prerequisite: Alchemist 12, cognatogen discovery or cognatogen class ability

Benefit: The alchemist’s mutagen now grants a +4 natural armor bonus, a +6 alchemical bonus to one mental ability score (Intelligence, Wisdom, or Charisma), and a +4 alchemical bonus to a second mental ability score. The alchemist takes a –2 penalty on both associated physical ability scores as long as the mutagen persists, and takes 2 points of ability damage to both associated physical ability scores when the cognatogen ends.

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