
Modrinth · Minecraft mod
Lost Souls
The Lost Cities addon to add more danger to the buildings.
Quick answer
Which Lost Souls release should I use?
Lost Souls 1.20-4.1.7 targets 1.20.1 with Forge. Do not install it on the client. It must be installed on the dedicated server. All 1 required mods have matching files.
Where it goes
Is Lost Souls required on the client, server, or both?
Do not install it on the client. It must be installed on the dedicated server.
This file is marked server-only.
What else does Lost Souls 1.20-4.1.7 need?
1.20-4.1.7. Change the file and its required mods may change too.
Install The Lost Cities first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Lost Souls without breaking your instance.
Built for Lost Souls 1.20-4.1.7. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.20-4.1.7. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install The Lost Cities first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
Do not install it on the client. It must be installed on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.20-4.1.7. It opens that exact file at the source.
About this project
What does Lost Souls add?
Lost Souls
This mod is a simple but very configurable mod that is designed to work with The Lost Cities. It makes buildings a lot more challenging by spawning additional and stronger mobs in them. There is a big chance that a building is 'haunted'. If it is haunted then there very strong vanilla mobs will spawn (boosted for damage and health) until the player manages to kill a specific number of them at which point the building is considered 'cleared'. The mobs spawn when the player is in the building but regardless of lighting level so it doesn't help to light up the building (can be disabled with config).
This mod is very configurable. You can control what kind of mobs can spawn this way, how many can spawn, the kind of armor and weapons they get. How strong they are and so on.
Note that this mod is server-side only.
Modpacks
Feel free to use this mod in any modpack you want.
Project description from Modrinth.
Pick your setup
Lost Souls by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
1 loader build1.20.1
1 loader build1.19.3
1 loader build1.19.2
1 loader build1.18.2
1 loader build1.12.2
1 loader build1.12.1
1 loader build1.12
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Lost Souls versions and loaders
1.20-4.1.7
lostsouls-1.20-4.1.7.jar
13 Aug 2026
1.21-5.0.1
lostsouls-1.21-5.0.1.jar
26 Dec 2025
1.20-4.1.6
lostsouls-1.20-4.1.6.jar
26 Dec 2025
1.21-5.0.0
lostsouls-1.21-5.0.0.jar
4 Dec 2025
1.20-4.1.5
lostsouls-1.20-4.1.5.jar
12 Sept 2025
1.20-4.1.4
lostsouls-1.20-4.1.4.jar
3 Aug 2025
1.20-4.1.3
lostsouls-1.20-4.1.3.jar
2 Aug 2025
1.20-4.1.2
lostsouls-1.20-4.1.2.jar
2 Aug 2025
1.20-4.1.1
lostsouls-1.20-4.1.1.jar
2 Aug 2025
1.20-4.1.1
lostsouls-1.20-4.1.1.jar
12 Jul 2025
1.20-4.1.0
lostsouls-1.20-4.1.0.jar
12 Aug 2024
1.19-3.1.0
lostsouls-1.19-3.1.0.jar
12 Aug 2024
Looking for an older file? The official Modrinth project page is in Resources.