Ok so it's Mongol light cav, and we all knew that it was coming but here's the desctiption from the .com

Mongol Light Cav.
The Mongol Light Cavalryman is the mainstay of Mongol armies from Peking to Poland. They are very fast, equipped with axes and powerful bows, and are dangerous opponents both at a distance and in hand to hand combat. Their ferocity and determination are legendary.

Go run with that

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It's not a bug, it's a feature