How can cleared towns fill back in from somewhere else?

Short answer

Wandering Zombies moves zombies that are already in the world. The author says it supports B42 multiplayer, the timing can be configured, and it does not spawn new zombies. Turning respawn off in the sandbox is not this. Respawn creates new zombies. Migration moves existing ones.

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Mods that do this

Big Chiefs Dynamic Hordes Ultimate Survival

A different horde item. Do not assume it only moves existing zombies.

On this page

Big Chiefs Dynamic Hordes Ultimate Survival is a different Workshop item. Do not read it as "the same mod, but louder." Check that page for whether it creates groups. A scheduled attack on your base is a third request. Describe that in the search box instead of using this page's answer.

Move existing zombies, or run a different horde

OptionWhat it doesWhat it is notAuthor note
Wandering ZombiesSends existing zombies through the world on a timer you can changeA switch that creates new zombies, or a nightly raid eventAuthor states B42 multiplayer and no new spawns. Not a playtest of your server.
Big Chiefs Dynamic HordesA separate horde modA renamed Wandering ZombiesRead its page before you assume it only moves zombies that already exist.
Sandbox respawnPopulation settings already in the gameA substitute for migrationOff means cleared cells are not refilled by respawn. Zombies can still walk in.

If the town goes quiet and you want pressure from outside, start with Wandering Zombies and the sandbox respawn setting side by side. Add the other horde mod only after you know you want whatever that page actually does.

The Build 42 overview does not pick a horde mod. Use the search above if you need a nightly attack rather than migration.

Common questions

I turned respawn off. Why are zombies still arriving?

Because zombies already on the map can walk into a cleared area. Respawn and migration are different. Wandering Zombies is about the walking, and the author says it does not spawn new zombies.

Does Wandering Zombies create a horde on top of me?

That is not what the author describes. It moves existing zombies and lets you set how often. A mod that drops a new group on your base is a different design.

Is Big Chiefs Dynamic Hordes the same recommendation?

No. It is a different Workshop item. Use it only after its page matches the kind of horde you want.

Will this stay light on a multiplayer server?

The author states B42 multiplayer for Wandering Zombies. How heavy a given frequency feels on your server is something you have to try. This page has not measured that.

Sources