Formidulus
With Formidulus, a Souls-Like boss fight arrives on Fabric 1.21.1, with weapons, a support item and cosmetic gear that come with their own abilities.
What it does
Formidulus adds one challenging Souls-Like boss, a fight built around careful timing rather than raw damage. Its soundtrack was made by Efefski. The content also includes two weapons and one support item, each carrying a special ability that changes how a fight is approached, along with two decorative blocks, two cosmetic equipment pieces and one structure.
Formidulus requires Fabric API, which must be installed alongside it. Trinkets is an optional dependency: some features depend on it, and they stay unavailable when it is missing. Cardinal Components API is bundled inside the mod, so it needs no separate install. The mod runs on Fabric for 1.21.1, with the latest file at 0.1.2-beta, released 2025-01-13 on the beta channel. It is released under the MIT License, and the code is open source with public source code and an issue tracker.
The server and every player need the mod installed. Formidulus was first published on 2024-10-28 and last updated on 2025-01-13. The author recommends ModMenu for managing mods in the game.
Key features
Souls-Like boss
A single challenging boss fight in the style of Souls-Like games, with a custom soundtrack by Efefski.
Weapons with abilities
Two weapons, each with a special ability that alters combat when it is used.
Support item
One support item that carries its own special ability for use during a fight.
Decorative and cosmetic content
Two decorative blocks and two cosmetic equipment pieces, plus one structure in the world.
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
Optional 1
Embedded 1
Use cases
Who it’s for: The mod suits players who want a difficult boss fight in the Souls-Like style, and server owners who want that fight available to every player on their server.
How it compares
Handles! is an MIT-licensed open source Fabric mod for client and server, published for 1.21 – 1.21.1. MSW Compat is also Fabric-only and open source, but under the GNU General Public License v3.0 only, with files for 1.21.1. Formidulus stays on 1.21.1 alone and is open source under the MIT License, placing it in the same license family as Handles!.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Formidulus | Fabric | 1.21.1 | Client and server | 2025-01-13 |
| Handles! | Fabric | 1.21 – 1.21.1 | Client and server | 2024-09-11 |
| MSW Compat | Fabric | 1.21.1 | Client and server | 2026-06-04 |
Questions
Does Formidulus need Fabric API?
Does Formidulus need Trinkets?
Which loader does Formidulus support?
In the catalog
Formidulus is one of 19,031 Adventure mods on ModsFinder, and one of 10,052 Adventure mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from absolutelyaya
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What the author says
Trinkets is required for some features, doesn't have to be installed tho
Official listing
- Modrinth page
- modrinth.com/mod/formidulus
- Owner
- absolutelyaya
- Published
- 2024-10-28
- Updated on Modrinth
- 2025-01-13
- Facts verified
- 2026-10-15