Lethal Company - How to write your own mod from scratch!

In this video we go from 0 code to having a functioning mod in lethal company, no experience needed(but is recommended). We create the project, add our references, find what we want to patch, learn how to patch it, and make a functioning infinite sprint!
Please don't hesitate to reach out if you're running into issues or have questions !
How to setup bepinex with Lethal Company: • How to setup BepInEx w...
LC Modding Wiki: github.com/Let...
Modding Discord: / discord
Unofficial LC discord with modding community: / discord
GameMaster mod if you'd like an example to look at: github.com/law...
Bepinex: github.com/Bep...

[@iMinx]

If opening the exe file with ILSpy doesn't work, go into Lethal Company\Lethal Company_Data\Managed and select Assembly-CSharp.dll

[@gooscape9005]

Thanks

[@christopherchristensen9101]

Underrated, TY

[@deanbrannen930]

Love you

[@YoutubeITA]

thought I was already stuck, very good

[@genericjames7949]

I love you

[@scrumpieTF2]

It took me an ENTIRE WEEK to find a tutorial that explained how to change a VARIABLE. How did it take me this long? Great tutorial!

[@iMinx]

Glad it helped!

[@derrychip]

This tutorials great for starting to mod and easy to follow, although I'm struggling to figure out how I'd change an entities model, rigging, animation, sfx, and vfx. Could you make a video showing how to entities and assets if you're able to? That would be really helpful; thanks for the tutorial.

[@edapb5574]

Check out the lethal wiki on mod development?

[@2tonpotato]

@@edapb5574 thx

[@user-ln2ri9nx8u]

nvm

[@jacobtheriot8415]

Great tutorial, used this to make a mod that lets you teleport without dropping items, keep up the good work!

[@totoch07]

i dont think its a very good idea. It makes the teleporter too OP. but you could maybe make the price higher.

[@ethantwolfe]

@@totoch07 it's good that the mod is an option for players that want it!

[@mageguest]

It would be cool if it was an upgrade u can buy to the teleporter!

[@huuuuuuuuuuuuuuuuuuuuuuuuuuuhn]

ezmode@@ethantwolfe

[@TheOatmealGuy]

wow, JShlatt's girlfriend got a really deep voice and gained 3000 IQ ( In all seriousness, great video, really helpful, 10 outta 10 )

[@iMinx]

that one made me chuckle xD

[@stoops417]

6:13 This is referred to as a "Project". A solution may have many projects within in it, but all projects belong to a solution. Great tutorial, I appreciate the help so far!

[@Siphonife]

Need moar TopLevel Organizers.

[@rafaelmesaglio1399]

I'll add this here, 9:15 those are called Attributes in C# or more generally Decorators, they serve the purpose of adding metadata to first class members of the language (classes, functions, variables and so on) so that other code and tools can use them as data to manage your code. Also the attribute calls for a string as it's GUID so a namespace/package name like string as you did can work to avoid collisions, but the GUID in C# (or UUID elsewhere) is it's own data type, a 128bit randomly generated integer who's purpose is exactly extremely low collision chance. It looks like this when represented as a string "6B29FC40-CA47-1067-B31D-00DD010662DA"

[@almahnak12]

You don't have a clue on how hard it is to find a modding tutorial, I really appreciate tutorials like these, and I hope you can start doing more of them on more complex things like adding your own scrap or entities!

[@Strogman25]

15:13 That "It's not important" sounded SO OMINOUS lmao (Also fantastic video. Thank you so much!!)

[@Gerpar_]

Thank you, this video helped a ton with figuring out how to do some modding! I've used Unity for a while on my own games; 23:00 LateUpdate is called every frame after every other function in Update / FixedUpdate has finished for the frame, kinda like a "last pass" kind of function (fixedUpdate is similar to update, but runs on a set time based on whatever the unity physics simulation time was set to rather than every frame like Update does)

[@niborocin11]

I come from web-developing so it was pretty easy to follow along! I want to patch the spectating camera to be in first- instead of third person mode. But I am struggling to implement a more complex patch. Would you be willing to make a video showing us how to do a little more complex stuff and explain your thought process? Would be awesome! Thanks for your effort!

[@iMinx]

Absolutely, I am in the process of making a more advanced tutorial, and I will be sure to go more into depth on the though process behind it

[@phoenixxofficial]

I like that you explained things simply but also gave quite a few good examples of best practices, which are essential as your files and folders grow over time Thanks for the great vid, liked and subbed

[@magnusMakesGame]

Really helpful tutorial. I have now uploaded my first Lethal Company mod on Thunderstore. Thank you!

[@teamsmatkinsmith]

THANK YOU! This has helped me mod for other games as well. I just happened to start with lethal company.

[@SushiWolfYT]

I'm Currently working on a big mod that basically is wanting to make advanced company available for everyone again, but I have no idea where to start. What I would like to try and add *The menus after selecting a file for all the customizations *Lobby Section: Change the lobby size (4-40), can decide to keep it open, and even allow people to join when landed (Like LateCompany) *Moons Section: Where you can change the prices, disable/enable weathers, *Items Section: Where you can tweak scrap value, weight, tools values, Spawn Rates, Discount ranges for tools (store items will be in a separate section on the same page) *Enemy Section: Here you can tweak and change the spawn weights, what moons they spawn on, or if they even spawn at all (maybe make it so modded monsters can be tweaked here to?) *Day Section: Choose how long the days are, how many credits you can start with, Global Multipliers (Value, Amount, enemy power), Choose if you want longer deadlines, suit savability (choose if to enable), be able to enable that you can customize xp *Perks Section: a place where you can edit the unlockable perks like the cost, the percent increase, and if it's even active. uses xp to level up, not credits *Perks: Sprint Speed, Jump Height and Jump stamina in one (make it a bit more expensive), Sprint stamina, Stamina Regen, Fall damage, damge, weight, weight speed (lowers how much weight affects you with each upgrade), Crit Strike chance, Inventory slots *Ship perks: Scan Distance, Extra Battery, Extend Deadline discounts, Delivery speed, Save Loot, Travel Discount, Loot Worth (Like from LethalProgression, it increases the amount that the scrap is worth by a percentage with each upgrade) maybe make it possible to have presets? i am currently the only one working on this, and have made a post in the LC modding server asking if anyone wants to help, but currently i'm on my own

[@nokaneawe7951]

Huge thanks for the video, it really helped me figure out the basics of modding in LC!

[@Kjell1337]

Please make us a clown shoes purchasable. It makes sounds every step you take and attracts monsters. :D

[@akafriend-9264]

thanks for the tutorial! I wasn't able to find a lot of tutorials to make mods so I led myself up here. so far right now, Im still getting to hang of things and getting stuff setted up.

[@anthonybustamante5736]

I used this to help me get started with modding Content Warning. Thank you!

[@imLust]

Amazing upcoming modder bro i know your gonna be big for sure

[@iMinx]

Working on it, next mod is gonna be huge

[@AyamineMISC]

Thank you very much, I have experience with programming but never gave making mods a go before so I was unsure about where to start!

[@waffleboy7983]

Would love to see a video on making sound mods if ever. I just want to replace the sound when your sanity drops (seeing a dead body or something) with the intro riff to Everlong LMAO

[@Papa_Bless]

yes please

[@sp4cell4m45]

Just get the sound file into your project access it and play it instead of the other

[@Romulusmap]

Thank you for this. This was great introduction!

[@WeskCoast]

Thanks for the tutorial, really good intro to modding lethal.

[@NeatWolf]

Thanks for the guide! Tutorial/public speech tip for next video: Exercise to make a pause instead of saying "aaaahm" ;)

[@iMinx]

Something i definitely need to work on, thank you

[@phecdaDia]

Thanks for the quick and straight to the point tutorial. Helped a lot 😄

[@OllieBeeCookswithKnives]

Used this to make my own mod! Always had an interest for years, but this was a perfect guide to just get something down. If possible, could you give an example of how we would implement another part of the mod that isn't used in the "Update" section - if that makes sense. I'm new to C# but not coding in general, and I'm finding this to be a really fun way to learn. Thanks for this guide!

[@Toskan]

Thanks for the tutorial! Can you do more about many other things like key binding, modify textures...?

[@Akens888]

Thanks, as a VB classic guy this c# nonsense is confusing AF. Thanks to you I have successfully released a couple of mods, even managed to figure out the transpiler.

[@technomancer113]

This is super helpful - thanks so much!

[@captainkeyes9913]

sweet thank you for posting this, im mega thankful

[@thea.mgamer]

Can you make a video about how to add your own 3D models to the game that have their own properties, like a hat or a new piece of Scrap with it's own price and how much inventory space it takes or can you make a video that changes a 3d model already in the game

[@The404Studios]

you are real one :) thx - thepwner

[@AlexCodesGames]

Thanks for the video friend! So helpful!

[@jacksmith253]

exactly what i was looking thank you

[@boxtroxrequiem4882]

Assembly-Csharp not appearing 16:00 help me please

[@Vota_]

it no longer works with just the .exe, check pinned comment

[@flammablebearzy6713]

How does one make a model that can be imported to the game? The coding part we have to search what to change but how can we do the "bundle" of information such as model and sounds?

[@duayinepu2103]

Been trying to find this out for myself tbh

[@lime9699]

Fire tutorial. Thanks!

[@TREEBXY]

going into this not knowing a lick of coding i'll let ya'll know how it goes at the end (if i even make it that far lol)

[@itsvaporx9633]

let me know im do the same

[@vic-is-trying]

same here!! we’re in this together haha

[@ashersmith3466]

Dude, really good video

[@dailyuser6960]

I need help, Im using dnspy since ilspy doesnt work on my computer and i cant seem to find the assemblies that are related to lethal company

[@joel.perler]

same problem

[@samuelbjorkqvist2282]

Great video!

[@ThatDerpyGuySN]

Very interesting to someone who makes games but has never made a mod

[@VoidDevel0per]

Glad to see a fellow UE developer! How long have you been in the community?

[@iMinx]

I started about a week after the game launched, I recently left due to toxicity, unfortunately.

[@VoidDevel0per]

@@iMinx I personally haven't heard much about toxicity in the Unreal Engine community, Sad to hear. I've been around for a while lol

[@kitsunetengoku1467]

Using ILSpy For some reason the Assembly-CSharp sub folder is not quite showing, i did install the prerequirements. quite puzzled what could it be

[@bigbootyjudy439]

Same here bro. I’m hoping maybe he’ll comment on yours and I’ll get a notification

[@bigbootyjudy439]

Nevermind it’s in the pinned comment lol

[@aconamos]

You're a real G

[@Aaku13]

great guide! thank you so much.

[@SplinkoDinko]

this tutorial is really confusing, i havent even started yet and despite being "from scratch" as the title says i cant even find the thing hes started on how do i start a new project if you dont tell me how to start a new project, there is no way to get to that screen from where i am despite following all the steps

[@iMinx]

Sorry the tutorial doesn't include everything you'd like to see in it. There is an assumption of some basic coding knowledge as this is focusing more on the modding aspect of the code rather than an overview of how to write c# in general. For example, we're using an external mod loader that loads DLLs, so the project type would be a library.

[@HighlyNoted]

I did everything as said and even went back into code to fix any issues i was having, I finally got the game to read the patch but the infinite sprint is not working still

[@cyf0rk582]

I have a problem with decompiling Lethal Company.exe in ILSpy, can't find Assembly-CSharp when I open that .exe file. Followed exact same steps but can't figure out what I'm missing, what can be a cause for that?

[@user-vz4gg6cs4l]

same can't find it either

[@ashpog]

same here, i downloaded Assembly-Csharp.dll, added to sys32 and restarted my pc but it still wont show up Edit: check pinned comment ;)

[@user-vz4gg6cs4l]

@@ashpog im actually brain dead, thank you

[@cyf0rk582]

Yeah, didn't even see that comment and figured it out through his other video lol

[@drewalleman]

Nice Video!

[@tameranian]

Very good video! Very useful! And one question, do you know how custom moons with moonapi work? Been looking into it and I from what I can gather I need a assetbundle but I'm not too sure on how to do that.

[@minx4668]

Yeah so with asset bundles you need to have Unity installed to make one then load the asset bundle into the game (lc_api supports that)

[@tameranian]

managed to get kinda somewhere after decompiling the game and trying to use experimentation as a test custom moon, map seems to load when setting the ship to go there but if there's any sun source its blindingly bright and without a sun source and even with a flashlight all textures just seem to be black. bleh

[@MrStubbs]

When i open up lethal company in ILSpy I dont see assembly-CSharp

[@MrStubbs]

I found it in base\Lethal Company_Data\Managed

[@kennydblake]

Thank you! @@MrStubbs

[@KitoBallard]

Appreciate. I took to the comments in hoping someone asked and found an answer. Unfortunate he missed it but there's a lot of info here so it's to be expected.

[@fraaannn783]

Amazing tutorial! Trying to start modding after making a couple games, i have a question, the moment i play with someone with no plugins mine wont work too?

[@kineticbongos]

Been looking for a modding tutorial so I could make custom hoarding bug sounds!!!!!!

[@GHUTLUCK]

good video!

[@alejotassile6441]

What's the point of a mod if you're not adding new stuff? that said, excelent tutorial, It was realy helpful

[@mrsquiggles1379]

9:16 I think these are decorators if I do recall. Im not familiar with C# but I do use python and if it is the same as the @decorator_name you put above functions then Im just assuming it is the same. Hope Im right haha

[@WizardGCruz]

We call then attributes on c#

[@wyoonbrs]

is there a way to swap the model of enemy into something else? I would love to see a guide for that

[@astronovus7503]

Let me know if you figure it out or find a guide!

[@falon3983]

brooo i want to make an uncle ruckus bracken so bad

[@Bryndonshhpi]

Hey, I had a question regarding making audio mods for Lethal. Not sure how to convert the mp3 file I want to use into the file that most mods come with. Can't test the mod I wrote in game as I'm not sure if its the code or the fact the audio file is different than all the examples I've used.

[@manindrademel5779]

How do you get the debug terminal at 26:45 to show up on game start?

[@arbeyter]

root_folder/BepInEx/config/BepInEx.cfg Set "enable" after [Logging.Console] to true

[@YoutubeITA]

@@arbeyter where is root folder

[@YoutubeITA]

@@arbeyternevermind oke I found it

[@durpynyo4361]

i thought this was supposed to be beginner friendly, i don't understand what's going on

[@iMinx]

this is as beginner friendly as one can make this. This barely scratches the surface. You may want to start with learning c# in general or maybe start with python. Then, I recommend learning a bit of unity as you need to know certain things about unity to understand what happens with the mod.

[@igorbaltarejo4745]

9:14, i think they r called decorators for anyone curious

[@hallidayx]

Thanks

[@bennet7817]

That was 👌👍☺ It works.

[@Thethreestories]

Hi, there. This has been very useful to get quick-started on LC modding. However, VS Code version differences are getting in my way. Which exact release/version of VS Code are you using here?

[@Thethreestories]

And which vscode extensions, come to think of it? The main problem I'm having is that my solution explorer behaves very differently from yours and doesn't seem to have a way to add a reference.

[@Thethreestories]

Problem resolved! An install of VS Code 2019 proved to be more cooperative with the workflow you showed us. I was struggling with getting LC to decompile, but then I saw your comment above. Much obliged! Thanks for making LC modding easier for a newcomer like me! :)

[@nkgrimm9652]

tutorials great, just one issue. After I've made the mod, I try and run it and get this error: [Error : Unity Log] Couldn't extract exception string from exception of type TypeLoadException (another exception of class 'TypeLoadException' was thrown while processing the stack trace). Can't find anything about this...

[@nkgrimm9652]

any potential help is appreciated!

[@Uprank]

exact same issue, no solution found :|

[@nkgrimm9652]

@@Uprank i just redid the tutorial and it worked. Idrk what caused it though

[@nkgrimm9652]

Only difference in what i did was use NET 7.0 instead of 8.0

[@QuantumVT]

would this method work for replacing something like a in game model or something like that?

[@ImWhyMortalsCry]

I'm currently working on a new enemy I'm already done with planning, designing all I have to do is somehow get it into the game the way I imagined Let's see if this can help me with that

[@Edd6789]

It all worked great but i cant figure out how to do other things i want to do like making the vow bridge instantly collapse when a player touches it I found the lines of code that calculate it but i have no idea what to do with it all

[@greydepression]

Man, my files are literally everywhere else except where his are, then running the game with Bepin wouldn't generate any files. I guess I need to learn how to organize files before I can do this. Seems like a good turtorial for normal people I guess.

[@RoboticalHalloween]

From what it looks like to me, this tutorial shows how to add new code to the game. Let's say I'm trying to completely REPLACE some code from the game, is this possible?

[@Lemon4ik_gg]

Good Tutorial Thank

[@astraea926]

Thanks for the video, but I feel like you should clearly state at the beginning of the video what your example is about (I.e., the infinite sprint)

[@iMinx]

The point isn't necessarily to show how to do that one in particular, just a basic example of how to find something in the code, reference, and modify it.

[@Gloobusvevo]

Amazing tutorial, I just want to ask. This may seem like a stretch, but is it possible to create a mod that will change the hoarding bugs voices into sets of different voices? I want to make it the where there's 5 voices that are randomly given to a hoarding bug and each of those 5 voices will have different voice lines. The voices are gonna be recorded by me and some friends. How likely is that achievable for someone who has never done something like this?

[@left4twenty]

That should be possible, and there would be a few ways to get it done. In my mind, setting up a list of the voices, adding/referencing the sounds for each set and creating a function that assigns each spawned entity a random number corresponding to one of the items in the list The tutorials that unity has put out are pretty useful for getting a hang of some of the basic concepts

[@plooply]

idk if its possible but id love to have something that would let me swap models ( like taking the front straps off for better shirts)

[@Corbnorb]

I have a question about moon costs, I cannot seem to find it anywhere within the code.

[@tomgrimard8075]

Hmmmm, I wanted to make a custom moon, but I don't know if I would be able to. I know Unity and C# a bit, but I know nothing about modding. What I wonder are gonna be adding items, map and textures, ennemies. I was thinking of a visualshader as well. I already have a moon name and I know what kind of map I want to use. I'll try to get as much time as I can during school off time to make everything. In the hopes that I can make one. Saw a comment about someone making one but having troubles with the lights. Hope that I'll be able to overcome that problem. I never finish a game so i thought that a mod mind be easier for me, since I just have to add things and not remake everything from scratch!

[@vak__]

Thank you!

[@jacksonalder9610]

Do you have anything on installing ILspy? i can dowload a zip from the github but im not too sure where to go after that. The ReadMe hasnt been much help. Thanks.

[@individuality4422]

How hard is it to replace the main characters texture? I've made a simple replacement for it by extracting the textures and just messing around, but how would I make that a mod? Is the code simple? Thanks

[@mikegiorgianni4416]

im struggling with the same issue, i actually couldnt even find the main characters texture i was looking all around for it, for suits the only thing i found was unlockable suits what class did you find it in? I think unlockable suits would be what youre looking for and you set them to unlocked on startup or something like that

[@John_Macaroni]

have you found out how to do this already?@@mikegiorgianni4416

[@ragnarrocksoft9096]

Awsome tutorial. I will not use this knowledge wisely.

[@ReinQuest]

why did yours do something when you hit ctrl + B and mine just sat their like I'm an idiot?

[@dmeads5663]

I want to change the soda can into a Busch light Apple can

[@dyls_123_8]

@iMinx Do you have/could you make a tutorial on how to create a custom HUD mod for Lethal Company?

[@KitoBallard]

I appreciate the guide for sure. had a little trouble with a few steps since you went a bit fast a few times. I want to modify some loot but I can't find any references to any of them. Do you or anyone who surfs by and see this happen to know where I could find em so I could possibly tweak them?

[@enclavesoldier6320]

Hey man, great tutorial but I have one question I want to try and create my own piece of scrap that spawns on the higher end moons. I don't need anything special but I would like a Tip or tutorial on how to do that. Thank you

[@kapella1987]

I have a question. Would it be possible to create a mod to greatly reduce the volume of lightning strikes from Weather Stormy?

[@user-mo4wf5ev5r]

Excellent ! By the way , do you know how to open debug mode? I wanna test something.

[@raccoonandfox2778]

Is there a way to reference a method rather than a variable? Looking to call a method at the end of Update for example.

[@iMinx]

yes you would call class.methodname, you may need to get a reference to the class in some cases, or you may just be able to call it

[@carminatti8246]

I want to add more content. Is the same thing that you do it on the video?

[@akito9535]

Is there an explaining about "How to change monster's mode"

[@SushiWolfYT]

how did you get the smaller search bar to appear?

[@Immusama]

Hoping I can use this to mod a different game that uses IL2CPP. Just starting out with this. I do have very basic knowledge of coding but obviously need this to get started :D

[@iMinx]

That’s gonna be a bit different, best of luck though!

[@Immusama]

@@iMinx Do you think you can do a tutorial on that too :)?

[@pastellepuppy]

9:12 those are called Attributes

[@muggrootbeer]

Question is it possible to replace a model? I want to replace a enemy model with different custom model and was wondering if its possible.

[@astronovus7503]

If you figure out how or find a guide, lmk

[@legatt.]

let me know too, if you can do it

[@claymorwan]

That's a very interesting and helpful video I wanna know tho, where did u learned all that, cuz that would help me for making my mod

[@iMinx]

I learned by watching a video on how to mod valheim

[@claymorwan]

@@iMinx I see, that would probably be helpful, ty :3

[@0xnaif325]

I got error "Couldn't extract exception string from exception of type TypeLoadException (another exception of class 'TypeLoadException' was thrown while processing the stack trace)" From BepInEx Console

[@mxsxngaming]

this tutorial good

[@corneliusjr.]

Hey, do you know if it would be possible to change the ship model to make it bigger with the hitboxes all working?

[@moxopixel]

Im very very new into this, but do you write reflections in this tutorial?

[@iMinx]

Not in this tutorial, in one of my other videos I have utilized reflections, this one is very basic