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There is a Legacy version here.

PFS StandardMonster Warden Feat 2

Ranger 
Source Player Core pg. 159 2.0
Prerequisites Monster Hunter

You understand how to defend against your prey. When you grant bonuses from Monster Hunter, each creature who benefits also gains a +2 circumstance bonus either to their AC the next time the creature attacks them or to their next saving throw against an effect from that particular creature (whichever comes first.)