Max Potion ID Extender
by zabi94
Max Potion ID Extender is a small Forge coremod for Minecraft 1.12.2 that raises the limit on potion effect IDs, which is set by a 32-bit integer near 2 billion.
What it does
Mods that add many status effects can run short of potion IDs in a modpack. This coremod lifts that ceiling so a pack can register far more effects before it runs out. It works by changing how the game's potion ID limit is handled at a low level, and it is limited to Minecraft 1.12.2 on Forge.
The mod is needed on both the client and the server, since both sides must agree on the extended IDs. A client that connects to a server without it can run into odd and unpredictable results, and it may be unable to join at all. Back up the world before installing or removing the mod, because the change can damage existing worlds. Porting to later versions is not planned: the code is extremely difficult to backport, and newer releases of the game support more potion IDs natively.
Files cover only 1.12.2. The latest Forge file is 1.0.3, published on 2024-06-16. The project is open source under the MIT License, and its source code and issue tracker are public.
Key features
Higher potion ID limit
Lifts the cap on potion effect IDs, which is a 32-bit integer close to 2 billion, for packs with many status effects.
Coremod approach
Works as a small coremod that changes the limit at load time, so the rest of the mod set is left alone.
Client and server pairing
Requires the same version on both sides, so a client without it cannot connect to a server that runs it.
Back up before changes
Installing or removing the mod can break existing worlds, so a backup is advised first.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Large modpacks
Pack builders who combine many status-effect mods can use the extra ID space to avoid running out of potion IDs.
Who it’s for: Modpack authors and server owners running Minecraft 1.12.2 with Forge, who combine several mods that each add status effects.
Questions
Does Max Potion ID Extender need to be installed on both sides?
Which Minecraft versions does the mod support?
Can the mod be safely added to an existing world?
In the catalog
Max Potion ID Extender is one of 3,545 Optimization mods on ModsFinder, and one of 1,441 Optimization mods for Forge. 2,920 mods support Minecraft 1.12.2.
More from zabi94
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What the author says
With the amount of mods adding status effects and potion effects, it is not uncommon to find yourself short of IDs when building your own modpack. Enter: Max Potion ID Extender. It's a small coremod that lifts the limit to the max value of a 32bit integer (something around 2 Billion IDs).
Official listing
- Modrinth page
- modrinth.com/mod/max-potion-id-extender
- Owner
- zabi94
- Published
- 2024-06-16
- Updated on Modrinth
- 2024-06-16
- Facts verified
- 2026-10-15