
Passive Boss Bars
This is a lightweight, server-side mod for modpack creators that allows you to make boss bars only appear when a boss is aggro. The mod "Mob Boss Bars" is…
⬇ Download on Modrinth

This mod is specifically for modpack developers and builds upon it's dependency mod: Mob Boss Bars
By default this mod will make it so that any boss that is passive/not aggro on the player will not show the boss bar. Once attacked/aggroed it will show a boss bar. This is especially useful if you want something like The Warden to have a boss bar, but only while fighting it, or if you're like me and want dragons spawning that are boss fights if attacked, but you don't want to clutter the screen/giveaway that there is a rare dragon nearby.
To edit the config, boot up the game once with this mod installed and search for the config file titled "aggro-boss-bars.json".
DEFAULT CONFIG:
{
"restrictToListedEntities": false,
"entityNamespaces": [],
"entityIds": [],
"excludedEntityIds":
[
"minecraft:ender_dragon"
],
"lingerTicks": 40,
"showOnlyToTargetedPlayer": false
}
Sidenote: You should not have to touch the config unless you do want certain mobs to have boss bars even when passive.
- "restrictToListedEntities" indicates that this mod will by default apply to all mobs that have boss bars via the Mob Boss Bars mod (which includes vanilla bosses). Set to True if you only want to effect the namespaces or IDs you manually input into the config
- "entityNamespaces" not to be confused with Ids, this is for grouping, example: "saintsdragons", "naturalist"
- "entityIds" this is where you would put your ID's you want to manually effect, example: minecraft:warden, saintsdragons:ignivorous, saintsdragons:volitans
- "excludedEntityIds" blacklist for this mod. By default includes the Ender Dragon
- "lingerTicks" the amount of ticks added to the boss bar after the boss is no longer aggro as to avoid flickering boss bars
- "showOnlyToTargetedPlayer" the bar is visible to all nearby players that the boss is aggro to. I recommend having this on as it may be immersion breakinf to fight a boss with your friend and to not have a boss bar simply because it's targeting them
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as passive-boss-bar-v1.0.jar — drop this file into the mods folder
- Download size: 9 KB
- Download link checked 24 Aug 2026 — working
These come from our own check of the pack file, not from the source page.