As the PCs draw near the city they see the walls, painted brightly in shades that, on first glance, seem to be sickly bright, the greens bringing to mind infection and the red was the color of arterial blood. The town, huddled around the walls like cowering mutts, was seemily abandoned and the entirety of it was under at least a food of deep black water.
As they draw near, a call goes up from the top of the walls, and suddenly there are people, most of those that live in the walls it seems, up there. They stand, shock still, with crossbows pointed at the PCs as one of their number lets down a rope and comes to meet them.
“Good travlers! You’ll have to forgive us our concern, there are many things that seek to kill us these days, and our enemy is growing ever more cunning.”
Additional Ideas (3)
A vaguely humanoid shape of moxious green rises up from the water before you, seeming to pull the algae and slime from the surface to sonstitue its form. As the head forms, it turns toward you, the jellified jaws opning to spill forth a false tounge of ooze and putrid flesh.
Formed from bodies left to putrefy within muddy graves and stagant waters, skuz number among the most disgusting of all undead. Consisting of equal parts stagnant water, rotting vegetation, and liquefied corpse, skuz are consumed by a blind need for vengeance, seekin to inflict their horrible demise upon all living creatures. Making their home amid swamps, sewers, and stagnant areas of ronds and rivers, they awair live prey to drag into their revolting pools. Preferring solitary existences, multiple skuz rarely linger together, with newly created spawn oozing away to pollute their own territories.
In the Forgotten Realms, skuz are most common in the Swamp of Akhlaur, the Wast Swamp, the Farsea Marshes, the River Umber, and a few locations along the coast of the Easting Reach. Rumor has it that, several times a year, the remains of the dead god Moandr exudes one or more powerful skuz, pssibly the forms of long-dead victims slowly excreted by the profane corpse's decay.
Crocs on mainstreet
Or any other large semi-aquatic animal swimming in the flooded roads.
Dozus 11:07 pm: Here's a subplot: the expansion of the bog is invading the local temple's cemetary. The priests ask you to move the remains to a safer location, wherein they uncover...
A local fungus explodes if hit or fallen upon. If any conflict takes place between intelligent foes, both sides will use it to their advantage.
"Quite near there happened to be a mound of earth, at the highest part of which were gowing thickets of cornel and a dense cluster of spiky myrtle-stems. I went up there and tried to wrench the green growth from the ground to provide a leafy covering for our altar. There I was confronted by a horrible and astonishing miracle. For, from the first bush which I tried to break off... blood oozed in dark drops, fouling the earth with its spots... A piteous moan came from the base of the mound and I heard a human voice answering me: 'Why, Aeneas, must you rend a poor sufferer? I am buried here... for I am Polydorus. Here death overpowered me in a crop of piercing iron pointed spears. And so a crop of resembling javelins has grown over me..."