A downloadable mod

The air is so humid and hot that I've begun sweating. That can't happen. I can't sweat. There isn't anything to sweat. I'm scared. This has to be an illusion... or does reality not matter in this place?

Lithium is a FPS-RPG hybrid building on traditional Doom gameplay with leveling and upgrades, also featuring mechanics such as an inventory system, deadlier enemies, monster mod and multiplayer compatibility, and a sci-fi story shrouded in the supernatural, inspired by games like EYE: Divine CybermancyShin Megami Tensei, and the Touhou series. A significant amount of features are planned still, but the core of the mod is completed.

Your mission as one of seven characters (three implemented as of version 1.7) is to investigate and put an end to an incident in which a portal to Hell has begun consuming the universe like a black hole. Your methods and purpose throughout this mission vary character to character, and you may meet some unexpected foes along the way. Each class has a unique story, arsenal, upgrades and more.

StatusIn development
CategoryGame mod
Release date Jan 10, 2017
Rated 4.8 out of 5 stars
(19 total ratings)
AuthorAlison Gray Watson
TagsDoom, mod
Average sessionA few hours
LanguagesEnglish, Japanese
InputsKeyboard, Mouse, Gamepad (any)
AccessibilityConfigurable controls
MultiplayerAd-hoc networked multiplayer
LinksSource code, Community


Lithium_1_7_0b.pk3 88 MB
Lithium_1_6_3.pk3 57 MB
Lithium_1_6_2.pk3 55 MB
Lithium_1_6_1.pk3 54 MB
Lithium_1_6.pk3 53 MB

Install instructions

Run the pk3 file with GZDoom by dragging it onto the executable. Requires an IWAD (game) file, if you don't own any you can download Freedoom.

If you're running this with a map set or monster mod, make sure to load them after Lithium.

Development log


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can't wait for the other characters

I'm super late to the party, but this a fantastic mod. Congrats on your brilliant work here!

I'm having trouble loading the 'Abyss' chapter though. Each time I boot the textures don't load in leaving the background all white (screen below). Am I supposed to load in a supporting wad or something?

No issues when loading other map packs.

(2 edits) (+1)

This is not a bug, it's just a stylistic choice. The missing texture in ZDoom actually looks like this, for reference:

Ah, it turns out I'm just an idiot.

Thanks for the speedy reply. I'm going back in, in that case!

Can't get past the story screen. I press E or Mouse1, and it doesn't do anything


Hold the button. This prompt is changed in the next version.

when ever I finish the first act my screen goes black and does not do anything. Is this normal? Using latest update and doom1 wad.

This is a known issue with Doom 1 and will be fixed in the next beta.

(1 edit)

it also happened with chex quest 3

How do I access the inventory to put on the armour that I have picked up, cause I have tried every button I can think of, and nothing works.

Open the CBI menu and click "Inventory."

Deleted 256 days ago
(3 edits) (+5)(-1)

Damn bro who are you lmao, pronouns have existed for thousands of years. You have pronouns.

Also John Romero said Trans Rights, cope and seethe


Why not just use a person's name?
It's right there in the upper right corner.

Use initials for brevity. Ex.: "Aw cool, AGW has released a new mod. IKARI is eager to test it!"



I have never been more excited to see an update!

why i cant get the pk3 file?

it's giving me

"script error, "LANGUAGE" line 1:"

"Found a string without a language specified."

how can i fix this ?

Update GZDoom.


Hello! Great work on this very fun mod, but I had a question.
Being able to turn light source things on and off is pretty neat, but it actually makes certain secrets inaccessible (such as in MAP04 of TNT: Evilution). Is there a a way to turn that feature off?


If you shoot the light source until it is destroyed, it will no longer be usable. You can do that to fix the issue.

hello! I don't meant to be a brother, but I have a problem with versions 1.6.3. When i try to launch it, I am given this error

Execution could not continue.

Script error, "Lithium_1_6_3.pk3:language.gfx.txt" line 1:
Found a string without a language specified

1.6.2 works fine, and haven't tried any other versions. Using LZdoom, which I figure is probably the reason for it, but figured I would ask about it all the same. Thank you for your time!

You need to use GZDoom for now. LZDoom should be able to run it whenever it gets the new font system.

I'm having the same trouble,and I tried to open with GZDoom...


You probably need to update GZDoom. It will only work in 4.3.3.


please fix this

this has been happening for the latest zdoom patches for a while



(4 edits)

The image link just leads to a 404.

Since  I can't see the image, I can only offer general advice. Make sure you're using the latest version of this mod (1.6.1 at the time of writing) and also that you get GZDoom 3.7.2. This is the version Lithium 1.6.1 was designed for, so it's possible the latest releases break it.

You can also get the latest version of Lithium linked by the Github page, which should run with the latest version of GZDoom. You'll have to compile it yourself, though.

Issue has been fixed as of 1.6.2.