Dimension and Elytra Control

Access to the End and the Nether, along with elytra flight inside those dimensions, is controlled through game rules. Changes apply immediately on a running server, without a restart, and are saved with the world. The settings are ordinary per-world game rules, so a world keeps its configuration between sessions.

The mod works by blocking Minecraft's standard fall-flying state instead of keeping a hardcoded list of item IDs, so vanilla-compatible modded elytras are covered as well. When elytra flight is restricted, the mod removes damage from unequipped elytras and clears the related status effects, leaving items, equipment, durability and effects in their normal state.

The mod is installed only on a dedicated server, and the Nether rule cannot override the vanilla setting. With allow-nether=false in server.properties, the Nether stays disabled regardless of this mod, so that setting is recommended for servers that want the Nether closed. Players do not need to install anything, and the restrictions stay off by default until an administrator enables them. The mod is open source under the MIT License and is published only for 1.21.1.