Vaclav is the leader of an army whose goal is to conquer the world. Long before appearing in the story, he sends a young eren named Senel Coolidge to capture the Merines in one Village of the Ferines on the Mainland. Senel eventually begins to befriend the Ferines, and fails to respond to Vaclav. This causes Vaclav and his forces to launch an attack on the village, killing many of the Ferines. Senel and the Merines, Shirley Fennes, manage to escape, leaving Vaclav without any leads. Afterward, Vaclav captures Stella Telmes, and takes her to the Legacy in order to begin his plans for the future.