OOUndeadExpansion

OOUndeadExpansion turns the animal life of your world into part of the undead threat.

Zombies and zombie animals can infect supported animals, creating hostile undead variants with their own behavior, sounds, visuals, and configurable stats. Infected animals use dedicated zombie visuals and can become another source of danger in the world. With the right items, they can also be cured back into living animals.

The mod was commissioned for the Ominous Odyssey modpack and is built for hostile survival gameplay, horror-leaning packs, and worlds where infection should feel like an active part of the ecosystem.

Features

Hostile zombie variants for many vanilla animals.
Infection when supported animals are killed by zombies or zombie animals.
Curing with Weakness effect and a Golden Apple.
Configurable stats, loot, natural spawning, biome lists, and group sizes.
Zombie animal reinforcements and help calls.
Villager avoidance and zombie villager conversion support.

Mobs

Vanilla-Based

Zombie Chicken
Zombie Cow
Zombie Pig
Zombie Sheep
Zombie Wolf
Zombie Ocelot
Zombie Llama
Frozen Polar Bear
Hostile Zombie Horse

Compatibility Mobs

Zombie Panda - requires Future MC.
Drowned Turtle - requires Oceanic Expanse.
Drowned Dolphin - requires Oceanic Expanse.
Hostile Glow Squid - replaces Oceanic Expanse glow squid when Oceanic Expanse is installed.

Infection And Curing

Infection is the main threat loop: animals killed by zombies or zombie animals can come back as hostile undead variants.

Animals can also be cured using Weakness effect and a Golden Apple, similar to vanilla zombie villagers, with unique animal data restored where supported.

Compatibility

Required

Minecraft 1.12.2
Minecraft Forge 14.23.5.2847 or newer
MixinBooter

Optional

Future MC - enables zombie panda support.
Oceanic Expanse - enables drowned dolphins, drowned turtles, hostile glow squid replacement, OE sounds, OE loot fallback, and OE mob conversions.

Optional compatibility content is only enabled when the related mod is installed.

Configuration

The mod includes configuration for natural spawning, mob stats, loot, biome lists, group sizes, and several mob-specific behaviors.

Examples include:

Llama spit behavior.
Pig death cloud behavior.
Wolf healing.
Ocelot spawn effects.
Polar bear effects.
Dolphin's Grace support.
Aquatic spawn heights.