Wacko Beacons

The mod is a proof of concept rather than a gameplay addition. It shows that a server-side problem lets beacons behave in specific ways, and that the game allows a player to obtain beacon level 2 or higher in certain cases. The author describes the beacon as working in an unusual way, with two separate effects, a primary and a secondary, and the secondary effect is not checked on the server to confirm it matches the primary.

Beacon effects at level 1, including regeneration, are handled entirely on the client. The author reports that choosing the same effect as primary and secondary can grant the level II version, and that the server validates only whether each chosen effect is valid, without checking whether it is obtainable at the current beacon level. A cost-saving case is also described, in which strength can be enabled with nine diamond blocks instead of the usual fifty.

The mod runs on the client alone, so a server does not need it and players join without installing it. It requires Fabric API, and the files are published for Fabric only, across eight release versions. The latest file is 1.1.0 for 1.21.11, dated 2025-05-26, and the code is released under the GNU General Public License v2.0 or later, so it is open source.