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There is a Legacy version here.

PFS StandardCobra Stance [one-action] Feat 4

Monk Stance 
Source Player Core 2 pg. 121

You enter a tightly coiled stance, with your hands poised as venomous fangs. While in this stance, the only Strikes you can make are cobra fang unarmed attacks. These deal 1d4 piercing damage; are in the brawling group; and have the agile, deadly d10, finesse, unarmed, and venomous traits.

While in Cobra Stance, you gain a +1 circumstance bonus to Fortitude saves and your Fortitude DC, and you gain poison resistance equal to half your level.

Cobra Stance Leads To...

Cobra Envenom

Traits

Stance:

A stance is a general combat strategy that you enter by using an action with the stance trait, and you remain in for some time. A stance lasts until you get knocked out, until its requirements (if any) are violated, until the encounter ends, or until you use a stance action again, whichever comes first. After you take an action with the stance trait, you can’t take another one for 1 round. You can enter or be in a stance only in encounter mode. You can Dismiss a stance.