Bossominium
by Shaywsgu
Bossominium is a Forge mod that adds several new bosses to a Minecraft world, each with its own unique item drops for players to craft from.
What it does
The bosses bring a challenge to the game, and each one leaves unique item drops that players use in crafting. The mod covers 23 bosses and 46 achievements, and the items a player builds depend on whether they want offensive or defensive gear. A starting item called Bossdexium is granted when a new world begins, and an in-game item guide explains how to summon each boss.
Bossominium requires Geckolib to work. The mod is published for Forge only, with files for 1.19.4 and 1.20.1, and its environment is client and server, so the server and every player need it. The latest Forge file is 18.6 for 1.20.1, released on 2025-01-26, and the code is licensed as All rights reserved, so the mod is not open source.
Key features
Multiple new bosses
The mod adds 23 bosses, each one testing a player's gear and preparation.
Unique item drops
Every boss drops items that can be used in crafting, giving each fight a distinct reward.
Achievements
The mod includes 46 achievements tied to bosses and their drops.
Starting item and guide
A new world begins with the Bossdexium item, and an in-game guide lists how to summon each boss.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Boss progression on a server
Server owners can run the bosses as milestones, since every player on the server needs the mod to take part in the fights.
Crafting-focused survival
Players who enjoy building offensive or defensive equipment can plan their crafting around the drops each boss leaves behind.
Who it’s for: Players who want boss fights with crafted rewards, and server owners who want a set of bosses for their world. Both the server and each player need the mod installed.
How it compares
Epic of My Fantasy is a Forge mod for 1.20.1 that is also client and server, under All rights reserved and not open source. MineTerrariaBosses is a Forge mod for 1.16.5 that is client and server, released under The Unlicense and not open source, so it targets an older version. Cataclysm Summons is open source under the MIT License, works on Forge and NeoForge across 1.19.2 – 1.20.1, and is client and server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Bossominium | Forge | 1.19.4 – 1.20.1 | Client and server | 2025-01-26 |
| Epic of My Fantasy | Forge | 1.20.1 | Client and server | 2025-10-04 |
| MineTerrariaBosses | Forge | 1.16.5 | Client and server | 2022-12-09 |
| Cataclysm Summons | Forge and NeoForge | 1.19.2 – 1.20.1 | Client and server | 2025-05-14 |
Questions
Does Bossominium require another mod?
Does the server need Bossominium?
Which game versions does Bossominium support?
In the catalog
Bossominium is one of 11,058 Mobs mods on ModsFinder, and one of 6,527 Mobs mods for Forge. 34,764 mods support Minecraft 1.20.1.
More from Shaywsgu
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What the author says
NOTE: This mod will no longer be updated due to the original files being corrupeted, thank you all for the great support this mod has gotten, this mod has had a great run ## Introduction The Bossominium mod is a mod that adds multiple bosses into the game. All these bosses have unique item drops that you could use…
Official listing
- Modrinth page
- modrinth.com/mod/bossominium
- Owner
- Shaywsgu
- Published
- 2024-03-18
- Updated on Modrinth
- 2025-01-26
- Facts verified
- 2026-10-15