Aquifer
Aquifer is a Fabric library for 1.21.1 that other mods can call, containing shared code and a set of tags that extend block behavior.
What it does
Aquifer supplies code that other mods can reuse instead of bundling their own copies. It is meant to sit alongside other mods, and it can also run on its own without changing anything until another mod asks for its code.
Its main contribution is a group of block tags that let mods modify behavior that is otherwise hardcoded into Minecraft. Tags cover climbable blocks, enchantment power providers and flammable blocks, and mods can add custom blocks to the tags for their own functions.
The library is published only for Fabric, for 1.21.1, as a single build from 2026-02-25. Fabric API is required, and the environment is client and server, so the server and every player need it. The code is released under the MIT License and is open source, and public source code is available.
Key features
Shared library code
Provides code that other mods can use, so they do not need to ship their own copies of common helpers.
Block tags for behavior
Tags such as minecraft:climbable and minecraft:enchantment_power_provider let mods extend which blocks count as climbable or as enchantment power sources.
Functional block tags
Crafting tables, looms, cartography tables, smithing tables, stonecutters and similar blocks are grouped under tags so custom versions can work with their GUIs.
Flammable and nature blocks
Flammable blocks and crafted beehives are covered by tags, including the bee nest block that generates in trees.
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
Mod developers
Developers who want to add custom crafting, enchanting or smithing blocks can register them under the matching tags so the GUI functions correctly.
Server owners adding mods
Servers that run several Mountain Spring mods can share one library instead of each mod bringing its own helper code.
Who it’s for: Mod developers adding custom functional blocks, and players running packs where several mods rely on the same shared code.
Questions
Does Aquifer need Fabric API?
Does Aquifer have to be installed on both sides?
Which loaders does Aquifer support?
In the catalog
Aquifer is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Aquifer is a library mod containing shared code for other Mountain Spring mods as well as other useful features. Aquifer is intended to be used with other mods, however using it standalone is ok. The mod contains several tags to help extend and modify various hardcoded behaviors, some (but not all) of which were…
Official listing
- Modrinth page
- modrinth.com/mod/ms-aquifer
- Owner
- Team Mountain Spring
- Published
- 2026-02-21
- Updated on Modrinth
- 2026-02-25
- Facts verified
- 2026-10-15