Progressive Bosses
Progressive Bosses, a Forge mod for 1.20.1, adds a boss progression in the style of Terraria with Calamity and Fargo's Souls as reference points, with bosses that open one after another.
What it does
Bosses are arranged in a sequence, so each fight becomes available as the player advances through the progression. The mod draws on the boss ladder found in Terraria and in the Calamity and Fargo's Souls style of play, and it fits survival worlds where players want a clear path of goals. Blood Magic is named among the related content, and Enough Items (JEI) is supported for browsing recipes and items.
The mod also changes anvil enchanting, removing the experience expenses that normally apply to it. Progressive Bosses is published for Forge only, with builds for 1.20.1, and the latest file is 1.0.1, released 2026-07-26 on the alpha channel. A server running it needs every connecting player to have it too. The code is All rights reserved and the project is not open source.
Key features
Progressive boss sequence
Bosses are placed in an order that players work through, with each encounter tied to the previous one.
Terraria-style progression
The boss ladder follows the pattern of Terraria, where each defeat opens the next challenge.
Blood Magic integration
Content linked to Blood Magic is included, letting players combine boss progress with that magic system.
Anvil enchanting without expenses
Enchanting at an anvil no longer costs experience, so enchantments can be applied without that extra expense.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players of Forge 1.20.1 who want a boss progression in the Terraria and Calamity style, and server owners who want a gated sequence of bosses for a shared world.
How it compares
Calamity is a Forge mod for 1.20.1 that runs on client and server and is released under the Creative Commons Attribution Non Commercial 4.0 license, so its terms differ from the All rights reserved license of Progressive Bosses. Lethality - A Terramity Addon is also a Forge 1.20.1 client and server mod, released under CC0 1.0 Universal, so it can be reused more freely. Vizer covers Forge and NeoForge for 1.20 – 1.20.6, and either side can run it while neither needs it, so installing it on a single side is enough.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Progressive Bosses | Forge | 1.20.1 | Client and server | 2026-07-26 |
| Calamity | Forge | 1.20.1 | Client and server | 2026-07-27 |
| 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
Which loader does Progressive Bosses use?
Does the server need Progressive Bosses?
Does the mod change how anvils cost experience?
In the catalog
Progressive Bosses 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.
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Official listing
- Modrinth page
- modrinth.com/mod/progressive-bosses-genzalphaplayer
- Owner
- GenZalphaPlayer
- Published
- 2026-06-24
- Updated on Modrinth
- 2026-07-26
- Facts verified
- 2026-10-15