Subscribe to download
Upgradeable Dupes And Critters

(v1.0.5 In-game Configuration added. New Defaults are different than description below.
See change notes or changelog.
Previous versions are in the previous_versions folder if you want to install an older version locally.)


Use Radioactive Serum to modify your Duplicants' and Critters' DNA to increase their stats.


Duplicants receive +10 to all stats, +3 Morale, and +1,000 kCal stomach capacity at the cost of +100g/s oxygen consumption and 1,000 kCal/cycle increased food consumption per Upgrade Level. Max Level is 9.

Duplicants are upgraded at the Duplicant Upgrader building which requires the Duplicant to have the GlowStick trait which is consumed on use.

GlowStick trait is granted by a Doctor with Advanced Medical Care at the Injection Chamber using Radioactive Serum.

Radioactive Serum is made at the Nuclear Apothecary by a Duplicant with Medicine Compounding using Radbolts, Glass, Salt Water, and Steel. ( 2/sec, 1kg, 1kg, 1kg) (200 second crafting time)


Critters receive a flat +100 Metabolism and +100% Scale Growth bonus per Upgrade Level. Resources dropped on death are also increased by +100% per level. Max Level is 9.

Critter upgrade level automatically propagates to the offspring of a modified critter.

Glum and Miserable effects have been changed from -80 flat to -80% multiplier.


There is a graphical bug when delivering Radioactive Serum to the Critter Upgrader where the sprite for the serum stays at the last place the Duplicant was holding it. This has no effect on functionality. Resolves on reload or usage of the building.

Using debug tools to delete a critter that is on the Input Tile for the Critter Upgrader causes a crash so don't do that.

Crash reports can be put in the ONI Discord Server "mod-crash-help" channel.
Player.log file and steps to reproduce are required. Save file would probably be useful.

Non crash related issues can be directed to the "modded-gameplay" channel.


Credit to Sgt_Imalas and his mod Critter Traits Reborn available under MIT License for most aspects related to critter upgrade propagation.

Credit to PeterHan for his modding library PLib available under MIT License for in game options menu for configuration.

Original Mod Idea by Nigit in the ONI Discord.