Fathom Mod
Fathom Mod adds RPG-style weapons, trinkets, a biome and a mob to NeoForge, built around a boss-driven adventure progression.
What it does
The content centers on combat. The mod adds 9 weapons split into 3 weapon classes and 18 trinkets that players equip for passive effects, along with one biome and one mob to encounter in it. The author describes the scope as heavily inspired by Terraria, and notes an ULTRAKILL-like feel in the combat.
Fathom Mod runs on NeoForge and needs the server and every player to have it, since it is listed as client and server. Geckolib is a required dependency and must be installed alongside it. Files are published for four game versions, with 1.1 for 1.21.4 as the latest NeoForge build from 2025-10-03. The mod is released under All rights reserved and is not open source, though its source code and issue tracker are public.
The author has announced further content, including a Blood Moon Harvest event, and has chosen not to list every item in advance to keep future updates a surprise.
Key features
Nine weapons in three classes
Nine weapons are grouped into three classes, giving players distinct styles of combat to choose between.
Eighteen trinkets
Eighteen trinkets provide passive bonuses that players equip alongside their weapons and armor.
Biome and mob
One added biome and one mob give players a new area and a new enemy to fight within the adventure progression.
Expanded content planned
The author plans further additions, including a Blood Moon Harvest event, to expand the mod over time.
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
Use cases
Terraria-style progression
Players who enjoy boss-driven progression with gear sets and accessories can use the weapons and trinkets to build a character over several sessions.
Multiplayer servers
Server owners who run modded adventure worlds can add the mod, since clients and the server must both run it for the content to work.
Who it’s for: Players who want RPG-style combat with weapons and trinkets, and server owners who host adventure worlds on NeoForge. Geckolib must be present on both sides.
How it compares
Terraria Fishing Crates is a NeoForge mod for 1.21 – 1.21.1 that adds fishing crates, and it is open source under the MIT License. Content of Calamity is a NeoForge mod for 1.21.8 only, and it is released under All rights reserved. Fathom Mod targets 1.21 – 1.21.4 and is not open source, and it also runs as client and server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Fathom Mod | NeoForge | 1.21 – 1.21.4 | Client and server | 2025-10-03 |
| Terraria Fishing Crates | NeoForge | 1.21 – 1.21.1 | Client and server | 2026-03-31 |
| Content of Calamity | NeoForge | 1.21.8 | Client and server | 2026-04-16 |
Questions
Does Fathom Mod need Geckolib?
Which game versions does Fathom Mod support?
Does the server need Fathom Mod installed?
In the catalog
Fathom Mod is one of 17,631 Equipment mods on ModsFinder, and one of 7,420 Equipment mods for NeoForge. 17,979 mods support Minecraft 1.21.4.
Similar mods
What the author says
Expected content in Blood Moon Harvest: - Secret - "Yo, [IveTouchedGrass], you know what I realized? Maybe if i don't spoil the contents of the update, the hype will be even bigger for when it actually drops some time this year."
Official listing
- Modrinth page
- modrinth.com/mod/fathommod
- Owner
- IncredaSlimey
- Published
- 2025-09-13
- Updated on Modrinth
- 2025-10-03
- Facts verified
- 2026-10-15