Lost Souls
by McJty
Lost Souls turns the buildings generated by The Lost Cities into harder encounters, with extra and stronger mobs that spawn inside them.
What it does
Lost Souls is an addon for The Lost Cities, which must be installed alongside it. Some of the buildings the Lost Cities generator creates can become haunted, and a haunted building spawns additional mobs, with strong vanilla mobs boosted in damage and health. The mobs keep spawning until the player clears the building, which the mod counts once a set number of points has been reached. Mob spawning ignores the light level, so lighting a building up does not stop the spawns.
The mod is server-side only: the server runs it, and players join without installing anything. It is configurable. Server owners can turn it off, choose which kinds of mobs appear, set how many spawn, and adjust the armor and weapons they carry and how strong they are. The source code and issue tracker are public, and the project is released under the MIT License, so it is open source. Files target Forge and NeoForge for 1.20.1 and 1.21.1, with builds covering 1.12 – 1.21.1 and the latest files dated 2026-08-13 and 2025-12-26.
Key features
Haunted buildings
A share of the Lost Cities buildings is marked as haunted, and those buildings take on the added challenge.
Boosted vanilla mobs
Strong vanilla mobs appear in haunted buildings with raised damage and health.
Clearing threshold
A building counts as cleared once a specific number of points is reached, and spawns stop there.
Configurable spawns
Mob types, spawn counts, armor and weapons can be set in the config, and the whole feature can be disabled.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 1
How it compares
Lost River is a Lost Cities-style world option for Forge and NeoForge, running on client and server and released under the MIT License, with files for 1.20.1 – 1.21.1. Big Lost City covers Fabric, Forge and NeoForge for 1.20.1 – 26.1.2, runs on client and server, and is not open source. Lost Cities Modern Tweaks is server required with client optional, under the MIT License, for 1.20.1 – 26.2.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Lost Souls | Forge and NeoForge | 1.12 – 1.21.1 | Server-side only | 2026-08-13 |
| Lost River | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2025-02-16 |
| Big Lost City | Fabric, Forge and NeoForge | 1.20.1 – 26.1.2 | Client and server | 2026-05-18 |
| Lost Cities Modern Tweaks | Fabric, Forge and NeoForge | 1.20.1 – 26.2 | Server required, client optional | 2026-09-13 |
Questions
Does Lost Souls need The Lost Cities?
Does Lost Souls have to be installed on the client?
Which loader should a server use for Lost Souls?
Can the difficulty of haunted buildings be changed?
In the catalog
Lost Souls is one of 8,515 World generation mods on ModsFinder, and one of 5,058 World generation mods for Forge. 32,366 mods support Minecraft 1.21.1.
More from McJty
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What the author says
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…
Official listing
- Modrinth page
- modrinth.com/mod/lost-souls
- Owner
- McJty
- Published
- 2023-01-26
- Updated on Modrinth
- 2026-08-13
- Facts verified
- 2026-10-15