Mounted Combat
From Compendium of Worldly Lore
Needs review
Source: Player's Handbook
Description: You are skilled in mounted Combat
Prerequisites: Ride (1 rank)
Required for: Aerial Mounted Combat, Improved Mounted Archery, Legacy of the Four Winds, Mounted Archery, Ride-By Attack, Tunnel Riding, Way of the Ox
Once per round when your mount is hit in combat, you may attempt a Ride check (as a reaction) to negate the hit. The hit is negated if your Ride check result is greater than the opponent's attack roll. (Essentially, the Ride check result becomes the mount's Armor Class if it's higher than the mount's regular AC.)
Special
A fighter may select Mounted Combat as one of his fighter bonus feats.