Calamity
Calamity is a Forge magic and boss mod for Minecraft 1.20.1 that adds over 25 custom bosses, a rogue class and a large set of new weapons and accessories.
What it does
The mod works as a large expansion project. Its bosses are custom-coded, several use bullet-hell attack patterns and multi-phase transitions, and the encounters are arranged as progression milestones from early game through to a post-Moon Lord endgame. Calamity runs on client and server, so the server and every player need it. Its files target only 1.20.1, and the latest Forge build is 1.0.4 for 1.20.1, published on 2026-07-27.
Beyond the bosses, the mod adds weapons, armor sets and accessories, with a rogue class that relies on a stealth meter, and summoner and sentry tools for a more classless playstyle. Calamity requires Curios API and Geckolib, and Better Combat is an optional dependency. The code is released under the Creative Commons Attribution Non Commercial 4.0 license and is not open source.
Key features
Custom-coded bosses
Over 25 bosses are custom-coded, with bullet-hell patterns, multi-phase transitions and detailed sprites.
Progression encounters
Early and mid-game trials lead to a post-Moon Lord gauntlet, with endgame fights such as the Devourer of Gods and Supreme Calamitas.
Rogue class weapons
A rogue class is built around a stealth meter, with weapons such as the Supernova that trigger large explosions.
Large item set
Over 2,000 items are added, including legendary armaments like the Exoblade and the rapid-fire Soma Prime.
Accessories and armor sets
Accessories and armor sets form an equipment system meant for complex builds and theory-crafting.
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 2
Optional 1
How it compares
Progressive Bosses is a Forge boss mod for 1.20.1 that runs on client and server and is released under All rights reserved, so it is not open source. Lethality - A Terramity Addon is also Forge-only for 1.20.1 with client and server environment, using the CC0 1.0 Universal dedication. Vizer differs more widely: it covers Forge and NeoForge for 1.20 – 1.20.6, and it works on either side, and neither side needs it.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Calamity | Forge | 1.20.1 | Client and server | 2026-07-27 |
| Progressive Bosses | Forge | 1.20.1 | Client and server | 2026-07-26 |
| Lethality - A Terramity Addon | Forge | 1.20.1 | Client and server | 2025-06-07 |
| Vizer | Forge and NeoForge | 1.20 – 1.20.6 | Client or server, optional | 2025-04-02 |
Questions
Does Calamity need Curios API and Geckolib?
Do the server and players both need Calamity?
Is there a wiki for Calamity?
In the catalog
Calamity is one of 7,216 Magic mods on ModsFinder, and one of 3,927 Magic mods for Forge. 34,764 mods support Minecraft 1.20.1.
Similar mods
What the author says
Calamity Mod: A Monumental Content & Progression Overhaul Project Philosophy and Scope The Calamity Mod is an ambitious, professional-grade expansion designed to extend the base game’s lifecycle by hundreds of hours. Our development philosophy focuses on "meaningful progression," ensuring that every new tier of…
Official listing
- Modrinth page
- modrinth.com/mod/calamity
- Owner
- liaoweicheng1030322
- Published
- 2026-02-08
- Updated on Modrinth
- 2026-07-27
- Facts verified
- 2026-10-15