Headless Horseman CR 10
Source: Pathfinder Carrion Crown Adventure Path
Whether spectral cavaliers from distant lands who lost their heads in battle or jilted equestrians decapitated by jealous rivals, headless horsemen are dangerous and deadly pursuers known to haunt dark roadways and abandoned bridges in the late hours of the night.
This haunt materializes as a headless, horse-bound spectre. Wearing ancient armor, its decapitated head hanging from the saddle of a rotting, ghostly equine, the spirit swiftly gallops across the roadway, attacking each round with a terrible, ethereal blade as the mage’s sword spell with a +16 attack bonus. Some roving specimens are known to continue pursuit far beyond their original area.