For Aquarion, Riding unlocks the Amphibian, a special unit that can move on water and replaces the Rider, and movement on shallow water. (This allows Aquarion to make Boats using captured Ports without researching Sailing.)
Riding's branches in the technology tree are focused on "destructive aspects."
- Midjiwan (20 Apr 2021). DevBlog: Balance Pass 1. Steam. “Thematically, [Clear Forest] fits well with the destructive aspects of the Riding branch (Disband ability, Clear Forest, Burn Forest)...”