Pelago-Archie Islands

If you ever decide to sail around the continent of Angstasia, then you're bound to eventually run into the Pelago-Archie Islands, which are located just east of the Bay of Gull. Local legends tell of a dread necromancer that eats children in order to get local children to behave. But those are just stories...right?

Once a month, all the ports close in the Pelago-Archie Islands. None are allowed to visit, and all visitors are asked to leave. Why? What's going on there that they don't want us to know about? Are they having human sacrifice rituals? Is there actually a dread necromancer eating children?