OOUndeadExpansion
by GrandeMalum
OOUndeadExpansion adds hostile zombie variants of vanilla animals, which spread an infection and can be cured back into living animals.
What it does
Zombies can infect supported animals, and an infected animal turns into a hostile undead variant with its own behavior, visuals and stats. The infected animals keep their vanilla friendly abilities but use them in dangerous ways, such as the Zombie Chicken and Zombie Cow. Zombie animals can also call reinforcements and avoid villagers, and villager conversion is supported.
Animals can be cured with a Weakness effect and a Golden Apple, which restores them to living form with their unique animal data where supported.
Installation covers the server and each player's game. Files are published for Forge only, for Minecraft 1.12.2, and the latest file is 1.1.1, released 2026-08-22. The mod is published under All rights reserved and is not open source.
Key features
Hostile zombie animals
Vanilla animals gain zombie variants that attack with the abilities they already had, now made dangerous.
Infection and cure
Zombies infect supported animals, and a Weakness effect with a Golden Apple cures them back to living animals.
Zombie reinforcements
Zombie animals call nearby reinforcements, and villagers are avoided during this behavior.
Configurable spawning
Stats, loot, biome lists and group sizes for natural spawning can all be adjusted in the config.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Horror-leaning survival packs
Modpacks and worlds built around hostile survival gameplay can use infection as an ongoing threat.
Who it’s for: Modpack authors and server owners who want an undead threat beyond vanilla zombies, especially for horror-themed survival worlds.
How it compares
Vulnerable Villagers Legacy is also for 1.12.2 on Forge, client or server and optional, and is open source under the GNU General Public License v3.0 only. Zombie Onslaught is client and server for 1.18.2 – 1.19.2 on Forge, is not open source and is under All rights reserved, so it targets newer versions.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| OOUndeadExpansion | Forge | 1.12.2 | Client and server | 2026-08-22 |
| Vulnerable Villagers Legacy | Forge | 1.12.2 | Client or server, optional | 2025-06-25 |
| Zombie Onslaught | Forge | 1.18.2 – 1.19.2 | Client and server | 2023-11-04 |
Questions
Does OOUndeadExpansion need to be installed on the server?
Which loader and version does OOUndeadExpansion support?
Can infected animals be restored?
In the catalog
OOUndeadExpansion is one of 11,058 Mobs mods on ModsFinder, and one of 6,527 Mobs mods for Forge. 2,920 mods support Minecraft 1.12.2.
Similar mods
What the author says
Zombies and zombie animals can infect supported animals, creating hostile undead variants with their own behavior, visuals, and configurable stats. Infected animals use vanilla friendly yet deadly abilities and can easily become a formidable source of danger in the world. With the right items, they can also be cured…
Official listing
- Modrinth page
- modrinth.com/mod/ooundeadexpansion
- Owner
- GrandeMalum
- Published
- 2026-07-07
- Updated on Modrinth
- 2026-08-22
- Facts verified
- 2026-10-15