This is exactly what Gaven needed, he didn't require Tun Marsh to generate millions or even tens of millions of value a year like Colossus City and Blood Gorge City. He merely needed the Blackscaled Lizardfolk here to develop steadily, becoming a source of naval forces for him, helping the City of Faith secure water routes, and the marine fishery products were enough to supply the City of Faith to some extent.
In many places, marshes often serve as lands of calamity, the origins of various disasters, whether from the Monster Tribes growing in strength within the marshes or from different viruses and plagues spreading from these areas. Even the powerful Komeer Kingdom was no exception; the expansive marsh had troubled them for countless centuries, reportedly always under the rule of the Dark Witch, as ancient as the Komeer Kingdom itself, leaving them helpless about Tun Marsh for decades.
