(General)
You can use your surroundings to accelerate your movement, and your enemy's presence pushes you further.
Prerequisites
Favored enemy class feature, favored terrain class feature.
Benefit
While you're in any of your favored terrain types, you gain a 5-foot bonus to your movement speed. This bonus increases to 10 feet if a creature of the same type as one of your favored enemies is visible and within the same terrain type.