As Zayn walked through the central square of the village one last time to prepare enough food and water for a week, Zayn found a large note stuck behind the blackboard of the village.
Because villages didn't have an Adventurer Hall, the blackboards were created. They were merely wooden boards with a bunch of pieces of paper pinned to them. The notes written on those pieces of paper mostly consisted of important pieces of information that should be known by everyone.
This included the precautions everyone was supposed to take when encountering the Undead. Couriers hired by the Adventurer Alliance were ordered to update the notes whenever necessary. That way even the isolated villages were informed when something interesting or dangerous happened.
As for the note that attracted Zayn's attention, it was something he would have never expected to attract his interest.