Boss Ultimatum
by ElocinDev
With Boss Ultimatum installed on a server, a boss that a player has killed can be set to heal, or be removed, once the configured death threshold is reached.
What it does
The mod changes how bosses recover after players die to them. Server owners set a minimum number of deaths that must occur before the ultimatum is triggered, and can choose between healing a boss to a maximum health value, healing it by a flat amount, or removing it altogether. Health gains can be applied before the ultimatum takes effect, and the setting can differ per difficulty, for example only on hard.
Installation runs on the server alone, so players join without installing anything. The mod needs Faux Custom Entity Data and Necronomicon API, and it is published for Forge, NeoForge and Fabric. The Fabric build targets 1.21.1, while the Forge and NeoForge builds target 1.20.1 or 1.21.1. The license is All rights reserved, so the code is not open source.
Key features
Maximum health healing
A boss can be healed to its maximum health once the death threshold is passed, instead of recovering a fixed amount.
Flat value healing
A boss can also be restored by a set number of health points each time the ultimatum applies.
Removal instead of healing
The ultimatum can remove the boss entirely rather than restoring it.
Per-difficulty settings
The trigger and the chosen effect can be configured separately for each difficulty level.
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 2
Use cases
Pacing a boss fight on a server
Server owners can make a boss harder to finish after repeated deaths, so a group that keeps failing faces a different outcome.
Adding ultimatums to other bosses
The config file lets owners add ultimatums to bosses from other mods, so one setup covers several encounters.
Who it’s for: Server owners who run boss encounters and want to control how bosses recover after repeated player deaths.
How it compares
Multiplayer Bosses is open source under the GNU General Public License v3.0 only, with Forge and NeoForge files for 1.20.1 – 1.21.1, and runs on both client and server. Epic RPG: Boss battle mode is server-side only, published for Forge and NeoForge across 1.20.1 – 1.21.1, and is not open source. Vital is client-side only and covers Fabric, Forge and NeoForge for 1.20.1 – 1.21.11, so it does not change boss behavior on a server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Boss Ultimatum | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Server-side only | 2025-05-04 |
| Multiplayer Bosses | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-03-15 |
| Epic RPG: Boss battle mode | Forge and NeoForge | 1.20.1 – 1.21.1 | Server-side only | 2026-09-22 |
| Vital | Fabric, Forge and NeoForge | 1.20.1 – 1.21.11 | Client-side only | 2026-06-12 |
Questions
Which dependencies does Boss Ultimatum need?
Does a player need to install Boss Ultimatum?
Why does the Fabric build only target 1.21.1?
In the catalog
Boss Ultimatum is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from ElocinDev
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What the author says
Ever wanted to punish players for dying over and over to bosses? Feel like it's easy to cheese a boss because players can just respawn infinitely to eventually kill a boss? Look no further! Boss Ultimatum solves that by adding a very customizable config that allows you to add "ultimatums" to bosses.
Official listing
- Modrinth page
- modrinth.com/mod/boss-ultimatum
- Owner
- ElocinDev
- Published
- 2025-05-04
- Updated on Modrinth
- 2025-05-04
- Facts verified
- 2026-10-15