Storm Riders of Khsar (Nehekhara Horsemen)

Storm Riders of Khsar (Nehekhara Horsemen) is a Tomb Kings melee cavalry unit introduced in Total War: Warhammer II with the Rise of the Tomb Kings DLC. Emerging from the desert dust clouds, these horsemen come charging out of the storm, and death rides with them.

They are one of the Legions of Legend.

Description
Regiments of Undead horsemen race across the sandy planes mounted on the fleshless remains of their once-proud steeds, weapons lowered as they gallop towards their foes. These skeletal riders drive their heavy spears into their foes with bone-jarring force, using well-aimed thrusts that punch clean through torsos and rip open throats in a spray of blood. Those not impaled by the cavalry rider's razor-sharp spearheads are trampled into the ground by the thundering hooves of skeletal steeds. When the Liche Priests summon the Tomb King's army from their sandy graves, fully formed cavalry columns stride out of the pyramids at the head of the legions. When the enemy is sighted, the cavalry regiment's hornblower signals the charge and a deep unsettling discord reverberates about the desert. This otherworldly sound shakes the dust from statues, and a disquieting feeling of dread permeates across the battlefield. As one, the Undead steeds gallop towards their quarry, the skeletal riders raising their shields and lowering their spears in perfect unison. It is a brave foe indeed that does not flee as these deathless horsemen bear down upon them.

Trivia
Khsar the Faceless was the Nehekharan God of the Desert. He does not have an animal form but can appear as the desert wind.