You gain bonuses against an enemy you have tracked to its lair.
Prerequisites: Favored Enemy class feature, Track
Benefit: If you spend at least 1 hour tracking an enemy, you can declare its lair (home, dwelling, or other living space) as a favored terrain for the next 24 hours. You can also declare that creature as a favored enemy for the next 24 hours. If that enemy is already a favored enemy or if its lair is already in favored terrain, you gain a +2 on top of the bonuses you would normally get.
I always think of rangers as the cold, relentless, and implacable stalkers of the world. If one decides to come after you, you can run and run but you can’t escape. He’ll get you eventually. This feat reflects that image.