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Custom Enemies - Overview


Make sure you've done everything in the LethalLib main page first. This page will briefly run through what needs to be done in order to implement your own custom enemies.

In next pages, we will assume you have a copy of the example project repository on you, and when we are referring to our Unity project, we are talking about the Unity project included in the example project repository.

Example Enemy Project Repository


Grab yourself a copy of the example enemy project at! Every asset used in the project is MIT Licensed, and can be used as a base for your own mod!

We have an example enemy project which includes the full source code, Unity project, and Blender project files used for making the enemy.


Blender is an amazing free program and it can do everything you want when making your 3D model. If you don't have a 3D model and want to make one yourself, we highly recommend using Blender.

You can install Blender from, and it's also available on Flathub for Linux users.

For getting started with making your 3D models in Blender, see 3D Modeling With Blender.


Lethal Company uses Unity version 2022.3.9f1, and therefore we should use it too in order to avoid any issues with version differences when exporting our asset bundles.


On Linux, Unity 2022.3.9f1 has a bug where it might output audio to the wrong audio device. This is particularly relevant when implementing sound effects for your enemy, though the enemy sounds still work in the game itself. If this bug happens, you can try using PulseAudio Volume Control to change Unity's audio output (appears as FMOD Ex App) to the correct one.

Alternatively, you could use a patchbay like qwpgraph to always force Unity to output into the audio device of your choosing. Do note that this only works if you are on PipeWire. If you are unsure on whether or not you are running PipeWire, you can see if $ ps -e | grep pipewire outputs anything. This command will list active processes that have "pipewire" in their name.

For information about how our custom enemy is configured in Unity, see Unity Project.

Enemy AI

Lastly, we will go through some helpful information for coding your own enemy AI. For the article, see Coding Our AI.