Terra is a big world. It's not hard to believe there are things that go bump in the night and remain unseen by anyone. And in the case of three of Terra's greatest disasters, this was no different. A mysterious assailant, a vanished town, and a sudden crater are all it took to bring attention to the world government.We are introduced to three people known only as the Horsemen. Though their tales are unknown to all, one thing is clear. They live up to their name by being the embodiment of a walking apocalypse. Discover who the Horsemen are and what their plans for Terra's future may be.