The Dawnline is a tabletop roleplaying game about a group of vampires protecting a nomadic village on a world where day and night are places, and where all of society lives in the twilight in between.
The vampires depend on their village for blood and companionship. Without the humans, they would starve in the wasteland or forget themselves as they regress into feral states.
At the same time, the village depends on the vampires. The twilight they travel through is not safe. It is filled with strange ruins, desperate raiders, feral vampires, other villages, and creatures from the Dark ahead.
Only the vampires can protect the village, and only the village can shelter the vampires.
If their alliance comes apart, there will be nothing left of either of them but ash on the Dawnline.