Concerning the Horizon Walker's Terrain Mastery and Dominance.

[Tysteriskenvar]

Does the Horizon Walker's Terrain Dominance abilties function even when not within that favored terrain?

[Killsmith]

I think so. They should work the same as terrain masteries. I'm not sure why they don't have the same text. Also note that you can trade a dominance for another mastery.