Datamancy
by Darkhax
Datamancy, a Darkhax library for Fabric and Forge, adds datapack-driven tags that control how turtles, armor and fuel items behave in the game.
What it does
Datamancy expands what datapacks and resource packs can accomplish. Its tags let pack authors mark turtle eggs, brewing fuel and respawn anchor fuel without writing code. Turtles that lay eggs are tied to a block tag, and items placed in a tag can serve as fuel for the brewing stand or the respawn anchor. Armor and boot slots are read as well: wearing an item from a tag in the armor slot keeps endermen and piglins from turning aggressive, and boots from a tag stop crops from being trampled. Armor trimmed with a set material counts toward the same effects.
The mod is aimed at modpack authors, adventure map designers and modders building new content who want a toolkit for these rules. Its server-side only environment means players join without installing anything, and the server alone runs it.
Installation requires Bookshelf and Fabric API, and the files target Fabric and Forge for 1.20.1. The mod is open source under the GNU Lesser General Public License v2.1 only, with public source code and an issue tracker. Its latest file is dated 2026-02-12.
Key features
Turtle egg tag
A block tag marks which blocks turtles can lay eggs on, so a datapack can extend that behavior.
Fuel tags
Item tags set which items work as brewing stand fuel and which work as respawn anchor fuel.
Enderman and piglin distraction
Armor from a tag, or armor trimmed with a material, stops endermen and piglins from turning aggressive.
Crop trampling prevention
Boots from a tag prevent players from trampling crops while they are worn.
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
How it compares
Don't Spawn On Me is also server-side only, open source under the MIT License and published for Fabric and Forge on 1.20.1, but it targets mob spawning rather than datapack tags. ItemGator is a Forge-only mod for 1.20.1 that runs on client and server and is licensed under the GNU General Public License v3.0 only, so it needs installing on both sides.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Datamancy | Fabric and Forge | 1.20.1 | Server-side only | 2026-02-12 |
| Don't Spawn On Me | Fabric and Forge | 1.20.1 | Server-side only | 2026-03-12 |
| ItemGator | Forge | 1.20.1 | Client and server | 2024-02-21 |
Questions
Does Datamancy require Bookshelf and Fabric API?
Do players need Datamancy installed?
Which loader should a pack use?
Does Datamancy change how mobs spawn?
In the catalog
Datamancy is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 34,764 mods support Minecraft 1.20.1.
More from Darkhax
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What the author says
Datamancy provides a suite of features that greatly expands what can be acomplished by data packs and resource packs. Whether you're a modpack author looking to tailor the gameplay experience, an adventure map designer crafting a unique story, or a modder developing new content, Datamancy is here to enhance your…
Official listing
- Modrinth page
- modrinth.com/mod/datamancy
- Owner
- Darkhax
- Published
- 2024-11-02
- Updated on Modrinth
- 2026-02-12
- Facts verified
- 2026-10-15