Swift Cavalry

Swift Cavalry, which are used by Seemacshee, are one the most common sights in top-ranked V Nation players. His skill, Sky Wind, attacks all targets with a chance for units to escape (like thorn warlock attacks). Swift Cavalry are used in conjunction with Caecius and Dance Troupe's to deal maximum damage in one strike. Swift Cavalry also naturally do high damage.
Lastly, Swift Cavalry are seen later on in the game, after Allies and Empires.
Sorry for the lack of a picture.