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There is a Legacy version here.

PFS StandardTangled Forest Stance [one-action] Feat 8

Monk Stance 
Source Player Core 2 pg. 123
Requirements You are unarmored.

You extend your arms like gnarled branches to interfere with your foes' movements. You can make lashing branch unarmed attacks. These deal 1d8 slashing damage; are in the brawling group; and have the agile, finesse, nonlethal, and unarmed traits.

While you're in Tangled Forest Stance and can act, every enemy in your reach that tries to move away from you must succeed at a Reflex save, Acrobatics check, or Athletics check against your class DC or be immobilized for that action. If you prefer, you can allow the enemy to move.

Tangled Forest Stance Leads To...

Tangled Forest Rake

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.