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Field Guide on Werewolves, and those who hunt them.
by Dr. Johan Kosdin Lerkoviski
Known Lycanthrope Hunter, Specializing in Werewolves
The greatest book ever written! HA-HA!
The party is walking through the forest at night when they come upon a clearing. Half a dozen black-robed corpses lie scattered across the ground, and a pentagram of blood is shoddily drawn in the dirt.
It seems these people summoned something they could not control. Whether or not the demon returns is up to the GM, but it would be just as rich if the demon never returned, and for the rest of the night, every stray sound or odd shadow will be jumped at!