Added

• /ef split — splits a fused elytra back into the original elytra + chestplate. Lossless for fusions made on 1.6+. Older fusions fall back to a blank elytra + blank chestplate of the matching tier, with the enchantments moved to the chestplate.
• Chat confirmation for /ef split with clickable [Confirm] [Cancel] buttons and a 30s timeout.
• Named elytras now carry their name into the fused result by default. Controlled by fusion.name_mode (elytra, chestplate, preserve, config).
• Per-tier toggle: set enabled: false on any material to remove its recipe without deleting the section.
• Global particle toggle: particles.enabled: false.
• Per-tier particle opt-out: set particle: "none" (or leave empty) to disable a tier's trail.
• All player-facing messages moved to messages: in config.yml. Supports & color codes and {placeholder} substitution. Empty string suppresses a line.
• New permissions: elytrafusion.use (default true) to fuse, elytrafusion.split (default true) to split. Useful with LuckPerms contexts if you want fusing restricted to certain worlds or ranks.

Changed

• Updating the jar no longer requires deleting config.yml. Missing keys fall back to packaged defaults at runtime, your file is never modified. If your config is out of date, a config-latest.yml reference is dropped next to it and the missing keys are listed in the console; if it's up to date, nothing extra is written.
• /ef reload now reloads the config, re-binds fallback defaults, and re-checks for missing keys.
• /ef split gives a different message depending on whether you're not holding an elytra at all vs. holding a plain (non-fused) one.

Fixed

• Invalid particle names no longer spam the console every tick. Warned once per unique bad value.
• Fusing a damaged elytra into a tier with lower max_durability (e.g. into leather) no longer produces an already-broken item.
• Fusing an already-fused elytra preserved the wrong snapshot. /ef split now always returns the very first elytra and chestplate regardless of how many times it's been re-fused.
• Update checker compared versions with Double.parseDouble, so 1.10 looked older than 1.5. Now compares numerically per dot-segment.
• Tab completion crashed when materials: was empty.
• bStats chart NPE'd on elytras without a display name; switched to the internal tag so it's language-independent.

Added support for the whole major version 1.21 not just a subversion

Performance: Optimized the damage listener to reduce server lag during high-intensity combat.
Unbreaking Fix: Re-wrote the durability logic. Unbreaking III now correctly gives your infused gear a 70% chance to ignore damage in combat.
Environmental Logic: Your armor will no longer take durability damage from drowning, starving, or freezing.
Secure Tagging: Switched to PersistentDataContainer for item tracking. Players can no longer "fake" an infused Elytra by just renaming a normal one in an anvil.
Update Checker: Added an update checker

• Added support for the new copper armor

• Added support for custom Elytra Fusion names
• You can now configure Elytra Fusion names via config.yml.