My take on the Horizon Walker as an opportunity to introduce favored terrain and the prestige class.
|3||Feral Hands, Favored Terrain|
Choose one from: arctic, coast, desert, forest, grassland, mountain, swamp, underdark, inner planes, outer planes
While in a favored terrain, you gain the non-damage bonus of Favored Enemy against all creatures of that terrain.
You gain a bonus favored terrain at levels 5, 7, 10, and 15.
When you use the attack action, you can make two attacks.
You exist comfortably in cold and hot conditions. You need half the normal amount of food and water for a member of your race. You ignore some penalties of extraplanar environments.
At 10th level, you can use the hidden, unpredictable magical pathways that some fey use to traverse space in a blink of an eye. On your turn, you can teleport up to 30 feet to a spot you can see. Each foot of this teleportation costs 1 foot of your movement. You can’t do this again until 1d4 rounds have passed.
If you attack a foe while benefiting from being hidden, your attacks for the remainder of that turn deal 2d8 bonus damage on a successful attack.