Biotech Expansion – Mammalia

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Author: Lennoxicon

Last revision: 11 Jun, 2025 at 23:44 UTC (9)

File size: 2.22 MB

On Steam Workshop

Description:
The Biotech Expansion Project

The BEP is a continuous project to add more genes focused on variety and unique mechanics and playstyles! This mod is the first of many modular mods, focusing on genes inspired by real life mammals. Check back frequently for new genes and other mods in the BEP!

CORE MOD: REQUIRED!

Biotech Expansion – Core https://steamcommunity.com/sharedfiles/filedetails/?id=2884018485

Other Biotech Expansion Mods

Biotech Expansion – Ear Hair Color Patch https://steamcommunity.com/sharedfiles/filedetails/?id=2879641542
Biotech Expansion – Mythic Gene Pack https://steamcommunity.com/sharedfiles/filedetails/?id=2883216840

MAMMALIA GENE PACK

From the creeping wolf to the screeching bat, the Mammalia gene pack implements xenotypes and genes heavily based on terran mammals. Gain fearsome natural weapons, stunning abilities, and plenty of cosmetic options for your own pawns and colonies.

Added Xenotypes:
Barkkin – Wolf/Fox
Bonecrown – Elk/Deer
Wiretail – Rat/Mouse
Hidewing – Bat
Seertusk – Elephant

Cloudpuff – Sheep
Haytankard – Cow
Hindhopper – Bunny/Rabbit
Blastheart – Boomalope

Important Note: For an xenotype to appear during gameplay (outside starting with it), it needs to belong in a faction. (As of the cross expansion update, this is no longer as true, but having the faction active makes it vastly more likely of running into one.) There are multiple factions in this mod, but only one is enabled by default when starting a new game, the Skulking Mammalkin Tribe, composed of Barkkin, Bonecrowns, Wiretails, Hidewings, and Seertusks. For other xenotypes to appear you must enable their faction in the dropdown menu when selecting factions for your game.

A Small Sample of Our Offerings!

Sharp Claws



Hidebound Wings



Psychic Fury Needle


A list of Xenotypes, some of their Unique Genes, and what Faction they’re in!


Short Description of All Functional Genes

Download
Required DLC:

These DLC should be installed in order to use this item.


RimWorld - Biotech
Required items:

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Biotech Expansion - CoreSteam Workshop