Multiplayer Boss Fight

A lightweight Minecraft mod that dynamically scales boss attributes based on the number of nearby players — without any performance overhead.

Features

Adjusts boss stats (health, damage, etc.) when players join or leave the fight.
Synchronization only happens when a boss enters or exits a player's client — no constant polling or lag.
Fully configurable per boss type (or boss tag) via a simple JSON file.

How It Works

When a player approaches a boss, the mod recalculates the boss's attributes according to the configured multipliers. When a player leaves, the stats update again. This event‑driven approach means no performance impact during normal gameplay.

Configuration

Example config/multiplayer_boss_fight/config.json:

[ { "entities": ["#forge:bosses", "minecraft:wither_boss"], "attribute_modifiers": [ { "attribute": "minecraft:generic.max_health", "operation": "MULTIPLY_TOTAL", "value": 0.4, "max_limit": 4 }, { "attribute": "minecraft:generic.attack_damage", "operation": "MULTIPLY_TOTAL", "value": 0.1, "max_limit": 4 } ] }, { "entities": ["minecraft:ender_dragon"], "attribute_modifiers": [ { "attribute": "minecraft:generic.max_health", "operation": "MULTIPLY_TOTAL", "value": 0.25, "max_limit": 4 }, { "attribute": "minecraft:generic.attack_damage", "operation": "MULTIPLY_TOTAL", "value": 0.1, "max_limit": 4 } ] } ]

Parameter Explanation

entities

List of boss entity IDs. You can use tags (prefixed with #).
attribute_modifiers

A list of attribute modifications, each containing:
- attribute – Attribute to modify (e.g. generic.max_health).
- operation – ADDITION, MULTIPLY_BASE, or MULTIPLY_TOTAL.
- value – Multiplier per player (e.g., 0.4 = +40% per player).
- max_limit – Upper limit of players that affect the boss. Additional players will not increase stats further.