CivBastion is a Vintage Story mod by Xel. CivBastion adds city and vault bastions that protect defined areas and control block reinforcement or placement.

Why this mod is worth installing
This utility is intended for Vintage Story Civ server administrators who need simple area protection around cities and vaults.
What CivBastion adds
CivBastion introduces two protection types. A city bastion covers a default 101×101 square and is suited to marking out a settlement or other large civic area.
A vault bastion protects a smaller default 21×21 square. Unlike a city bastion, it also blocks players from placing blocks inside its protected area.
Both bastion types prevent block reinforcing within their zones. Right-clicking a bastion displays the area it currently protects, making its boundaries easier to check during server administration.
Where to download CivBastion
The official Vintage Story Mod DB page is the right place to get the current release through the in-game mod manager.