Diamond World Border

Throwing diamonds at the border changes its size. Each diamond adds a configured width, and the border grows over a configured time, 10 seconds by default. Items other than diamonds can be added to the list with their own width and speed, so several items can each push the border by a different amount. Width values accept decimals down to one decimal place, such as 0.3, and a negative width per diamond makes the border shrink.

The mod is a server-side mechanic for survival worlds and multiplayer servers that want a border players can push outward with items. A stack of diamonds thrown in is consumed entirely, and the border cannot consume diamonds while it is growing, so a single throw cannot be repeated mid-expansion. Fabric API is required, and the mod is published only for Fabric.

Builds cover 1.20.1 – 1.21.3 across five release versions, and the latest file is 0.3.0+1.21 for 1.21.3, dated 2025-12-06. The code is licensed under the GNU General Public License v3.0 only, so it is open source, and the source code and issue tracker are public.