The Polluted Swamp has been undergoing changes ever since the Transia people conquered Wolf Castle and expelled the Plague Werewolves.
Members of the Avalon Church claimed it was a blessing from the God of Nature to the land, but the specifics of the blessing were unclear to these followers themselves. However, it was certain that after the sprawling Polluted Swamp was included in the Transia frontier, the sense of nature there grew stronger.
It seems the God of Nature had indeed decided to turn the Polluted Swamp, a vital ecological area on the continent, into his sacred land.
But as the decisive battle of the Maginot Line approached, the pace of change in the Polluted Swamp suddenly accelerated, and people soon noticed something was "off" about this blessing.
As for the cause, it was a small accident.
