CurseForge · Minecraft mod
Opposing Force
Aims to introduce a wide variety of enemies to Minecraft!
Quick answer
Which Opposing Force release should I use?
Opposing Force Opposing-Force-1.20.1-2.0.3.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Opposing Force required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Opposing Force Opposing-Force-1.20.1-2.0.3.jar need?
Opposing-Force-1.20.1-2.0.3.jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Opposing Force without breaking your instance.
Built for Opposing Force Opposing-Force-1.20.1-2.0.3.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use Opposing-Force-1.20.1-2.0.3.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside Opposing-Force-1.20.1-2.0.3.jar. It opens that exact file at the source.
About this project
What does Opposing Force add?

About Opposing Force
Opposing Force is an enemy mod that focuses on adding unique, fair and challenging enemies to your world, along with a variety of miscellaneous features. A major change Opposing Force will bring to your world is the introduction of a Post-Nether and Post-End progression gate. Certain enemies will only spawn after:
- Entering the Nether for the first time
- Killing the Ender Dragon for the first time
These events are per-world and one player triggering the event will trigger it for all players in a server. These progression gates can be disabled in the config, and are also data driven, so you can use a datapack to edit the post_nether and post_end tags.
The mobs that are Post-Nether and Post-End by default are:
Post-Nether
- Guzzler
- Dicer
Post-End
- Skyvern
Mobs in Opposing Force may spawn from worldgen features, in specific biomes, or in other specific places. You can configure the spawn height requirements for most of the mobs in the mod. The Skyvern has a special spawning mechanic, where it has a 2% chance to spawn every 30 seconds (15 seconds if it is raining), where the chance increases by 2% for every failed spawn. The chance and spawn attempts are individual per player. Another example is the Tart, which can spawn from an Infested Apple Tree, a worldgen feature. Most mobs in Opposing Force have drops, which can be crafted into tools and items or decorative blocks. In the future, we will have tooltips on these items explaining mechanics that might not be obvious. Opposing Force also adds features that do not come from mob drops. For example, Emerald Armor can be obtained from Wandering Traders.
Mod Loader and Version
This mod is currently being developed for Forge 1.20.1. No backports are planned. We will port the mod to newer versions when we feel the time is right. For 1.21.1 and beyond, the mod will use NeoForge.
For further questions, updates, teasers & more please join the Discord server!
https://discord.com/invite/3gFgDwynJW
Project description from CurseForge.
Pick your setup
Opposing Force by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Opposing Force versions and loaders
Opposing-Force-1.20.1-2.0.3.jar
7 Apr 2026
Opposing-Force-1.20.1-2.0.2.jar
3 Mar 2026
Opposing-Force-1.20.1-2.0.1.jar
2 Mar 2026
Opposing-Force-1.20.1-2.0.0.jar
1 Mar 2026
Opposing-Force-1.20.1-1.0.0.jar
27 Jun 2025
Looking for an older file? The official CurseForge project page is in Resources.