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There is a Legacy version here.

PFS StandardSerene MutagenItem 1+

Alchemical Consumable Elixir Mutagen Polymorph 
Source Player Core 2 pg. 290
Usage held in 1 hand; Bulk L
Activate [one-action] (manipulate)
You gain inner serenity, but you find violence off-putting.

Benefit You gain an item bonus to Will saves and Perception, Medicine, Nature, Religion, and Survival checks. This bonus improves when you attempt Will saves against mental effects.

Drawback You take a –1 penalty to attack rolls and save DCs of offensive spells, and a –1 penalty per damage die to all weapon, unarmed attack, and spell damage.

PFS StandardSerene Mutagen (Lesser)Item 1

Source Player Core 2 pg. 290
Price 4 gp
Bulk L
he bonus is +1, or +2 vs. mental, and the duration is 1 minute.

PFS StandardSerene Mutagen (Moderate)Item 3

Source Player Core 2 pg. 290
Price 12 gp
Bulk L
The bonus is +2, or +3 vs. mental, and the duration is 10 minutes.

PFS StandardSerene Mutagen (Greater)Item 11

Source Player Core 2 pg. 290
Price 300 gp
Bulk L
The bonus is +3, or +4 vs. mental, and the duration is 1 hour. When you roll a success on a Will save against a mental effect, you get a critical success instead.

PFS StandardSerene Mutagen (Major)Item 17

Source Player Core 2 pg. 290
Price 3,000 gp
Bulk L
The bonus is +4, and the duration is 1 hour. When you roll a success on a Will save against a mental effect, you get a critical success instead, and your critical failures on Will saves against mental effects become failures instead.