Enchantment Fusion

Anvils add enchantment levels together instead of capping them at the vanilla maximum.

Power V + Power V = Power X Sharpness V + Sharpness V = Sharpness X Sharpness X + Sharpness X = Sharpness XX … and so on.

This works for every enchantment in the game, including ones added by other mods, because the mod operates on the enchantment registry rather than on a hardcoded list.

What actually changes

Vanilla's anvil maths: equal levels give you one level more, different levels give you the higher one — and the result is then clamped to the enchantment's maximum. That is why Power V + Power V does nothing in vanilla: 5 + 5 wants to become 6, and gets cut back to 5.

This mod replaces that calculation with addition, in three cases:

On top of that:

• No more "Too Expensive!" on fusions. Vanilla blocks the anvil entirely at 40 experience levels, which would make unlimited stacking impossible. Costs still rise, but the anvil no longer refuses.
• No prior work penalty (by default). Vanilla doubles an item's repair cost on every anvil use, which makes it unworkable after a few steps — exactly what would kill this mod after five fusions. Re-enable it with priorWorkPenalty if you want it.
• Level display beyond X. Vanilla only knows the Roman numerals I through X; from level 11 on, the tooltip would show the raw translation key (enchantment.level.11). This mod supplies levels 11 to 255, still as Roman numerals (XI, XII, … CCLV).

Everything else about the anvil is left alone: plain repairs with material, renaming and ordinary book applications still run through vanilla logic. The mod only steps in when the sum differs from the vanilla result — and if another mod has already filled the output slot, this one stays out of the way.

The 255 ceiling

The mod itself sets no limit. Minecraft does, and it is a hard one:

// net.minecraft.world.item.enchantment.ItemEnchantments
private static final Codec<Integer> LEVEL_CODEC = Codec.intRange(1, 255);

if (i < 0 || i > 255) {
    throw new IllegalArgumentException("Enchantment " + entry.getKey() + " has invalid level " + i);
}

Above 255 an enchantment level can no longer be stored or sent to clients — the item would crash the game or be lost on save. 255 is therefore not a balance decision of this mod, it is the ceiling of the item format. That is why it stops at 255, and why the config cannot be set any higher.

In practice you will not notice: Power 255 on a bow is already absurdly far beyond anything vanilla intends.

Installation

1. Create a profile with Minecraft 1.21.3 and NeoForge (21.3.0 or newer).
2. Drop the jar into the profile's mods folder.
3. Launch.

The mod is required on both client and server. In multiplayer the server's config is the one that counts.

Configuration

config/enchantfusion-common.toml is created on first launch:

Compatibility

The mod hooks NeoForge's AnvilUpdateEvent, which fires before vanilla's anvil logic runs. No mixins are used, which makes it robust across Minecraft updates and friendly towards other anvil mods.

License

MIT.

Enchantment Fusion (Deutsch)

Verzauberungsstufen werden am Amboss addiert statt auf das Vanilla-Maximum begrenzt.

Stärke V + Stärke V = Stärke X Schärfe X + Schärfe X = Schärfe XX … und so weiter.

Das gilt für jede Verzauberung im Spiel, auch für die aus anderen Mods, weil die Mod nicht auf einer festen Liste arbeitet, sondern auf dem Verzauberungs-Register.

Drei Fälle werden abgedeckt: Buch + Buch (combineBooks), Gegenstand + Buch (applyToItems) und Gegenstand + Gegenstand (combineItems). Zusätzlich entfällt bei Fusionen die „Zu teuer!"-Sperre bei 40 Leveln, die Vorarbeits-Strafe ist standardmäßig aus, und die Stufen 11 bis 255 werden als römische Zahlen angezeigt.

Obergrenze 255: Minecraft kann Verzauberungsstufen über 255 nicht mehr speichern oder an Clients senden. Das ist keine Balance-Entscheidung der Mod, sondern die Decke des Item-Formats.

Installation: Minecraft 1.21.3 + NeoForge 21.3.0 oder neuer, Jar in den mods-Ordner. Client und Server. Im Mehrspieler entscheidet die Config des Servers.

Alle Optionen stehen in config/enchantfusion-common.toml — die Tabelle oben im englischen Teil listet sie vollständig auf.