You’ve learned to avoid and overcome the engulfing attacks of your studied prey.
Prerequisites
Favored enemy (ooze) ability.
Benefit
You gain a bonus to your CMD equal to half your favored enemy bonus. You also gain acid resistance equal to half your favored enemy bonus.
Against oozes, you instead apply your full favored enemy bonus for both benefits, and you can make a Reflex save to avoid being engulfed even if you make the attack of opportunity.