I would like to suggest either a crafting recipe for the bell or maybe get a Slimefun block or something that allows you to notify your town when you are under attack. If you were to do Slimefun or something like that you could make it capable of going off manually or whenever a enemy player is near your town.

What would this add:
I think that this would add to not only a realistic aspect as players can setup alarm systems within their town or even just be able to notify them with sound instead of screaming in the chat but I would say it adds to game function and roleplay.

How to Resolve:
Simplest : the simplest way I can think of would just add a crafting recipe for a bell.
Difficult: Create a custom Slimefun object or figure a alarm plugin that would like with the alert system already on the system. Setup a way for players to change if it's manual or auto and make sure it plays sound.

- Note : I'm sorry if I did this wrong this is my first suggestion :)

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