Arbitrium
by ItsSteven225
Arbitrium is a NeoForge decoration mod that adds crafting blocks, decorative blocks, paintings, ingots and new End city mobs for players on 1.21.1 – 1.21.8.
What it does
Arbitrium adds a set of new crafting blocks, along with decorative blocks, paintings and ingots. The ingots currently have no function beyond decoration, and the author notes that the upgrade path is still in progress. A new mob also appears in End cities.
The mod requires GeckLib on NeoForge, so GeckLib must be installed alongside it for the mod to load. The author notes that later versions of the mod no longer need GeckLib. Arbitrium works together with the Arbitrium extension and the amethyst extension, and it runs on client and server, so the server and every player need it.
Arbitrium is published for NeoForge across eight release versions, with 0.0.2 for 1.21.8 as the latest file. The first build appeared on 2025-08-25 and the latest update is dated 2025-08-27. The files are alpha builds, and the code is under All rights reserved, so the mod is not open source.
Key features
Crafting blocks
New blocks for crafting are added to the game, expanding the recipes available to players.
Decorative blocks and paintings
Decorative blocks, paintings and ingots add visual variety to builds, though the ingots have no function yet.
End city mob
A new mob spawns in End cities, adding a new encounter to exploration of those structures.
GeckLib dependency
The mod relies on GeckLib for its models and animations, and that library must be present on NeoForge.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Decorating builds
The decorative blocks and paintings suit players who want more materials for building and interior design.
End exploration
Players who explore End cities will meet the mob the mod adds to those structures.
Who it’s for: Players on NeoForge who want extra decorative blocks and a new End city mob. The mod is still in progress, so the ingot upgrade path and other features may change in later builds.
How it compares
Teleporter is a NeoForge mod for 1.21.4 – 1.21.8 that is client-side only and released under All rights reserved, so it differs from Arbitrium in both environment and version range. Amethyst Bricks Mod is a NeoForge mod for 1.21.1 that runs on client and server and is released under the MIT License, so it covers a narrower version range and uses a different license.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Arbitrium | NeoForge | 1.21.1 – 1.21.8 | Client and server | 2025-08-27 |
| Teleporter | NeoForge | 1.21.4 – 1.21.8 | Client-side only | 2025-08-24 |
| Amethyst Bricks Mod | NeoForge | 1.21.1 | Client and server | 2025-06-11 |
Questions
Does Arbitrium need GeckLib?
Does Arbitrium have to be installed on both sides?
Which game versions does Arbitrium support?
In the catalog
Arbitrium is one of 12,078 Decoration mods on ModsFinder, and one of 5,201 Decoration mods for NeoForge. 17,695 mods support Minecraft 1.21.8.
More from ItsSteven225
Similar mods
What the author says
What adds: > > New decorative blocks > > New paintings > > New ingots (without function) > > And an upgrade that doesn't work ( yet )
Official listing
- Modrinth page
- modrinth.com/mod/arbitrium
- Owner
- ItsSteven225
- Published
- 2025-08-25
- Updated on Modrinth
- 2025-08-27
- Facts verified
- 2026-10-15