
Replicator First Type
Evolving slimes harness solar energy and develop genetic mutations. Predatory spiders create evolutionary pressure. Features 12+ genes, horizontal gene…
⬇ Download on Modrinth





Replicator First Type introduces a living evolution ecosystem to Minecraft where pink replicator slimes spawn, adapt, and evolve through natural selection. These unique creatures harness solar energy through photosynthesis, seeking open sunlight when their energy drops or entering hibernation in darkness. This creates dynamic behavioral patterns as slimes navigate their environment to survive.
The mod features an advanced genetic system with over 12 different genes that affect size, speed, health, color, and special abilities like thermoregulation, flight, toxicity, and attack instincts. Slimes pass these traits to offspring through horizontal gene transfer, where newborns adopt genetic characteristics from nearby slimes rather than traditional reproduction. Each world generates unique evolutionary paths based on environmental pressures and random mutations.

Predatory spiders serve as the primary threat, hunting slimes to sustain themselves. After successfully killing a certain number of slimes, spiders lay eggs that hatch into new predators. The more successful a spider becomes at hunting, the more offspring it produces, creating intense evolutionary pressure on the slime population. Slimes equipped with attack genes can fight back and destroy spider eggs, establishing an evolutionary arms race between the two species.
The ecosystem self-regulates through survival pressure, where aggressive slimes risk death while passive ones hide but miss opportunities. Population sizes fluctuate naturally based on available resources and predation success. Players can observe evolution in action using the DNA Scanner to analyze slime genetics and track mutations over time.
The Mushroom (Passive Mob)
A completely new passive creature that stays in place
Spreads spores that affect nearby slimes

Evolution System Slimes can now transform into other creatures based on their genes reaching peak values: Slime → Mushroom: When gene M reaches 4 Spider → Spider Queen: When MAX_HUNTER reaches 25 More transformations coming soon!
The mod is designed primarily for creative mode but includes foundations for survival adaptation. Future updates will expand the ecosystem with additional genes, new creatures, environmental challenges, and increased genetic diversity.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- 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 Modrinth — 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 replicator_first_type-1.3.0-neoforge-1.21.1.jar — drop this file into the mods folder
- Download size: 1.2 MB
- Download link checked 5 Sept 2026 — working
These come from our own check of the pack file, not from the source page.