every couple in game days there is a chance for monster to raid the town and if no one defends the town things can be broken or pages/ molds could do missing.
there would be a chance that mob could spawn just outside or in the village to attack it. if the town is not defended in time book pages, mold, and structures would be damage and need to be found and or remade. on a successful defend you will be rewarded with in game items such as ore and hands maybe even a weapon. the tier of item you get could be depended on how much mobs you have killed during the raid.
Personal twist (optional)
you could get more point toward the goal if you killed using bow or throwing weapons.