Goosker's Passive Boss Bars
by Goosker
Goosker's Passive Boss Bars keeps boss bars hidden for mobs that stay passive and shows them only once a mob has aggroed a player, on Fabric for 1.20.1.
What it does
By default the mod makes a boss stay passive toward players and hides its boss bar until the mob is attacked or aggroed. Once that happens the bar appears, so the screen stays clear of bars for mobs that are not fighting. The Ender Dragon is included by default. Each boss in the config can be listed by ID and by namespace, and a separate excluded list works as a blacklist, so certain bosses can keep their bars even while passive.
The mod is a lightweight, server-side mod aimed at modpack creators who want boss bars to appear only during boss fights. Its behavior is set in a config file named aggro-boss-bars.json, which is created on the first launch with the mod installed. The lingerTicks option adds a number of ticks after a boss loses its aggro before the bar disappears, which avoids flickering. Mob Boss Bars is required for the mod to work, and modded mobs get their boss bars only through that dependency.
Installation needs Mob Boss Bars. Goosker's Passive Boss Bars is server-side only, so players join without installing it, and the source code is published. The mod is open source under the MIT License and has files for 1.20.1, with version 1.0 for 1.20.1 as the latest file.
Key features
Passive boss bars hidden
Bosses that are passive toward players do not show a boss bar, which keeps the screen free of bars until a fight starts.
Bar shown on aggro
A boss bar appears as soon as a mob is attacked or aggroes a player, and the mob's ID determines which bars are affected.
Config-based mob lists
The entityIds, entityNamespaces and excludedEntityIds lists in aggro-boss-bars.json select which mobs are affected and which are blacklisted.
Linger time setting
The lingerTicks option keeps a bar visible for a set number of ticks after aggro ends, so it does not flicker during short pauses.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
Configurable Boss Bars is a client-side only mod under the GNU General Public License v3.0 or later and is published for Fabric and NeoForge for 1.20.1 – 1.21.1. Bossbar Tweaks is also client-side only and open source under the same license, but has files only for Fabric and only for 1.21.9 – 26.2. Unlike these, Goosker's Passive Boss Bars runs on the server and is open source under the MIT License.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Goosker's Passive Boss Bars | Fabric | 1.20.1 | Server-side only | 2026-07-01 |
| Configurable Boss Bars | Fabric and NeoForge | 1.20.1 – 1.21.1 | Client-side only | 2024-09-25 |
| Bossbar Tweaks | Fabric | 1.21.9 – 26.2 | Client-side only | 2026-05-24 |
Questions
Does Passive Boss Bars need Mob Boss Bars?
Does a player need the mod installed?
How is the list of bosses changed?
In the catalog
Goosker's Passive Boss Bars is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 34,764 mods support Minecraft 1.20.1.
More from Goosker
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What the author says
NOTICE: If you download this mod alone, modded mob's boss bars will not appear by default as per this mod's dependency (a mod that allows you to give any mob a boss bar and customize it). Feel free to use this on any Modrinth or Curse Forge modpack.
Official listing
- Modrinth page
- modrinth.com/mod/gooskers-passive-boss-bars
- Owner
- Goosker
- Published
- 2026-07-01
- Updated on Modrinth
- 2026-07-01
- Facts verified
- 2026-10-15