Squish, Squish. Squish.
Bogmoors has been here for 721 years. It started with an ale stop for the Imperial invaders. From there it has been a similar stop for every wave of invaders since then, as well as every local for a good walk’s distance.
The PCs have been traveling for a long time down the same stretch or round with no sign of anything suspicious. As they cross over to the next hill they see a gigantic splater of blood with a bleached dragons scull in the center of it. It the dragon skull's mouth is a tattered backpack with something wiggling inside of it.