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Legendary Rider [Epic]
Ride 24 ranks.
The character doesn’t take a penalty on Ride checks when riding a mount without a saddle (bareback). The character never needs to make a Ride check to control a mount in combat (and even controlling a mount not trained for combat doesn’t require an action).
Without this feat, a character takes a –5 penalty on Ride checks without a saddle, and must make a Ride check to control a mount in combat (and controlling a mount not trained for combat requires a move action).