fusion-wither

Fusion Wither — Java + Bedrock

The vanilla Wither, rebuilt. Fusion Wither keeps the Java Edition encounter structure but replaces its
attack set with Bedrock Edition's: a ranged kiting phase, a berserk mid-fight, and a ground-hugging
phase 2 that deflects everything you shoot at it.

Everything is built on vanilla mechanics. No new blocks, items or dimensions, and it can be added to
an existing world at any time.

FEATURES

Spawning and awakening
• Reuses the vanilla 1.20.1 awakening sequence — hovering in place, soul particles, a charging boss bar, the closing explosion and roar
• During the awakening the boss does not evaluate phases, cast skills or regenerate, so the intro always plays out in full

Phase 1 — 100% to 50% HP
• Keeps 6.5 to 8.5 blocks of distance and fights as a ranged kiter
• Barrage: all three heads fire wither skulls on separate cooldowns, so the volleys arrive staggered instead of in one burst
• Bedrock dashes: 1 to 2 high-speed straight-line repositioning dashes, with no shots fired during a dash
• Target priority is vanilla: players before other mobs; with no valid target the boss simply stops acting

Berserk — below 50% HP
• Shot intervals shorten across the board and the fight switches to straight-line charges

Phase 2 — 50% HP and below
• Entry: falls straight down, lands, waits 4 ticks, then explodes into the new phase
• Hovers 2 to 3 blocks above the ground, low enough for melee
• Projectile armour: bows, crossbows, tridents, snowballs, fireballs and every other projectile are deflected; melee and explosions still work. This is intentional, not a bug
• Weighted behaviour pool alternates between barrage and ground-slam, with independent cooldowns
• When both behaviours are down, a low-pressure idle window opens — that is your damage window

Death sequence
• The killing blow is rewritten into a real fatal hit, so vanilla die() still runs
• Loot, XP and kill credit stay exactly vanilla
• The model stretches over 80 ticks while an ongoing wail pitches down

CONFIGURATION

43 tuning values are generated on first launch in config/fusion_wither-common.toml, in five groups:
wither (health, phase 2 threshold, awakening length), phase1 (kiting distance, cooldowns, dash speed
and count), shots (skull damage, wither duration, per-head intervals), phase2 (hover height, behaviour
weights, slam damage and speed, block breaking, entry fall), misc (regeneration, death sequence length,
sound interval, behaviour log).

Defaults are the reviewed game feel, so a fresh install behaves exactly as intended.
Changes apply with /reload or a server restart.

INSTALLATION

1. Minecraft 1.20.1 with Forge 47.x
2. Put fusion_wither-1.0.0.jar into the mods folder
3. Launch — no extra dependencies

Client and server are both recommended: the server owns all behaviour, the client is needed for the
death sequence animation. A server-only install works but the death animation will not be visible.

REQUIREMENTS

• Minecraft 1.20.1
• Forge 47.x (tested on 47.4.22 and 47.4.28)
• Java 17

DEBUG COMMANDS

/wboss requires OP (permission level 2). These commands only affect debugging and never change
normal gameplay.

• /wboss dump — phase, health, behaviour pool and cooldowns
• /wboss diag — coordinates, distance, target, armour state
• /wboss spawn — spawn a Wither with the full awakening animation
• /wboss phase 1|2 — force a phase
• /wboss act <behaviour> — force a behaviour
• /wboss cd — view or reset cooldowns
• /wboss armor on|off — toggle phase 2 armour
• /wboss hp <value> — set health
• /wboss desire on|off — toggle high attack desire

Command feedback is Chinese-only; it is the only non-vanilla text the mod adds.

KNOWN LIMITATIONS

• Only the vanilla Wither is changed — wither skeleton spawn caps and loot tables are untouched
• The phase 2 armour blocks projectiles only, by design
• Coexistence with other mods that rewrite Wither AI may conflict, since this mod takes over the horizontal movement in vanilla aiStep

LINKS

Source code: https://github.com/llxj12/fusion-wither
Issues: https://github.com/llxj12/fusion-wither/issues
Downloads: https://github.com/llxj12/fusion-wither/releases

Licensed under MIT.