Eswen, officially known as the Republic of Eswen, was an island nation situated in Sera's equatorial region. Due to its location, with half of the nation on the equator, the island had varying climates and biomes, resulting in a jungle environment in the north and a more temperate southern region. During the Pendulum Wars, Eswen fought as part of the Union of Independent Republics where there impressive Navy defeated Coalition forces in several important battles. In 27 B.E., the COG launched a large-scale invasion of Eswen, utilizing Army, Navy, and Marine forces, fighting their way to the capital and forcing an Esweni surrender. The COG annexed the nation soon after, using it as a staging ground to launch further assaults in the region.
After the Pendulum Wars, the Esweni began a massive rebuilding project to rebuild their Navy and was well underway when the Locust emerged six weeks after the Armistice. This slowed down, but not halted, the construction of numerous ships, which would become invaluable when the island had to be evacuated. For eight years, Eswen contributed troops and supplies to assist Coalition forces on the main continents, unfortunately, in 8 A.E., the Locust finally emerged on the island and within weeks had reduced the population from twenty four million to thirteen million. Over the next several months, the population continued to drop until the decision was made to abandon the island to the Horde. The remaining five hundred thousand people made their way to ports all over the country, evacuating onto the many naval ships, unfortunately, many people had to be left behind, causing over four hundred thousand people to be abandoned.
After the evacuation, the large fleet of ships, easily over a thousand and composed of both military and civilian vessels, sailed together; however, by the Battle of Ephyra in 10 A.E., the fleet had split in half. By the time of the Lightmass Bombing, only small flotillas remained, and when Jacinto was sunk in early 15 A.E., ships operated by themselves. During this time, it was unknown how many people remained alive on the island, as no ship dared to return for fear of the Locust many thought would be waiting for them. Unbeknownst to them, several thousand people survived in the forests and jungles of the island, careful not to draw attention to themselves.
Unfortunately, in early 16 A.E., the Lambent began emerging on the island, seemingly sensing out the surviving population, bringing the Esweni people even closer to extinction.