TslatEffectsLib
Java mod listed for Minecraft 1.19–1.21. Downloads from the MC Java Mods app on Android.
I don't know my version or loader
A small library for making MobEffects easier to use, and more dynamic
What is this?
The existing MobEffect class in Minecraft is very limited and has only very specific and basic functionality.
You can't really do a whole lot with it without needing extra events, mixins, or any combination or the two.
This lib does the work for you, adding several new hooks and features allowing you to make much better use of the effect system
Features:
- Instance-sensitive tick method
- Instance-sensitive display name
- Can-apply checks
- Mutually-exclusive effects check
- On-application callback
- On-reapplication callback
- On-removal callback
- Instance-sensitive shouldTick method
- Pre, during, and post attack method callbacks for both incoming and outgoing attacks
- Client-side tick callback
- Custom screen overlay render callback
- Helper classes for building effects and potions
- Experimental extended Enchantments support
How do I use it?
Just about everything you'll need to know is documented here:
https://github.com/Tslat/TslatEffectsLib/wiki
To get started, just have your new custom effect extend ExtendedMobEffect instead of MobEffect, then make use of any of the methods available to you
If you have issues or want to contribute, please jump on the GitHub page and make your voice heard
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20.1, 1.21.5, 1.21.3
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as TslatEffectsLib-neoforge-1.20.1-1.7.2.jar — drop this file into the mods folder
- Download size: 284 KB
- Download link checked 25 Sept 2026 — working
These come from our own check of the pack file, not from the source page.