Kuromizu: a hitchhiker's guide
The marshes of Kuromizu tend to be fairly benign, so long as one sticks to the roads. In times of trouble, though, the Imperial guard is unable to patrol the roads as well as they normally do, so thieves and bandits are more of a problem.
When deviating from the beaten path, the traveler may encounter any number of vile beasts, the most common of which are spiders. Now, the spiders of Kuromizu aren't your typical stomp-and-squish arachnids. A great power lies beneath the fetid waters, a power linked to the feywild. This power has bred a frightfully large version of spider that feeds on medium-sized creatures of any type.
While spiders are common threats for the lost explorer, there are greater and far fouler creatures in the swamps. The power of the bogs affects all who wallow in their waters... Legends abound of vampires and succubi, giant alligators still feeding on streams to the feywild, bandits, ghosts, and evil witches. All these stories likely bear some grain of truth.
The dark times threatening Hine have only fed the nightmarish stories about the mysteries that lurk in Kuromizu's marshes, and with the recent increase in disappearances of farmers and travelers, fear of the wilds breeds like a plague.