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There is a Legacy version here.

PFS StandardTwinned Defense (Fighter) [one-action] Feat 18*

Fighter Stance 
Source Player Core pg. 150 2.0
Archetype Dual-Weapon Warrior
Prerequisites Twin Parry
Requirements You are wielding two melee weapons, one in each hand
* This version of the Twinned Defense (Fighter) feat is intended for use with an Archetype and has a different level for access than the original feat.

You’re always ready to use your off-hand weapon to interfere with attacks against you. While you are in this stance, you constantly gain the benefits of the Twin Parry action.

Archetype Use

This feat can be used for one or more Archetypes in addition to the listed Classes. When selected this way, the feat is not considered to have its class traits.

Traits

Stance:

A stance is a general combat strategy that you enter by using an action with the stance trait, and that 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 enter a new stance, whichever comes first. After you use an action with the stance trait, you can’t use another one for 1 round. You can enter or be in a stance only in encounter mode.