This is Tihi

Another strong, independent woman is Tihi. Except, she's not a woman, she's a horse.

Better known as The Silent Tihi, she is a Friesian of the Northern Wood. Despite being ruled by Queen Snow White and Empyrean being ruled by four queens, the northern army is a place of honor reserved for stallions. Mares are turned out into the wild until they are old enough to be work horses.

Whether she wanted it or not, Tihi joins the quest to prove her worth, not only to the male-dominated army, but also to herself.