The greatest man-made extinction that wiped out most of the natural horses from the west coast, for the sake of war.
Horses are important for Valonia in both the economy and military, in which Krituss emperor, Kolonus, saw an opportunity to cut the enemy's power. Without caring for the long-term environment's impact, they slaughtered every horses they see in region. It might seem impossible, but they finally did it. The result was half of the horse species in the region has become extinct.