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Undertale: Lost Soul

Undertale: Lost Soul

MOD
A horror mod based on the setting of the game Undertale. Have fun playing, partner =)
by Cipher_Liar
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79 downloads
0 likes
Updated Oct 14, 2026
0 hypes
Adventure and RPG Horror Mobs World Gen
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You have wielded the blade countless times, slaying every monster in the underground world.

300 times, 500 times, the numbers have long become blurred. In pursuit of the so-called "perfection", you even tampered with the game's core files.

However, this time, the game refuses to be dominated by you anymore.

The data began to become chaotic, the screen flickering and distorted, and the monsters that should have disappeared returned in an even more terrifying form. Chara's mockery, misplaced texts, and the constantly recurring memories of massacres - they are no longer mere codes, but real nightmares.

In this out-of-control archive, you must confront the monsters you have created with your own hands, and search for the only and true "Save" amidst the endless bizarre events.

What else can you save? Or are you the one who needs to be saved?

lostsoul-0.4.2.jar
MC Client, 1.20.1, Forge, Server
Release 2026-10-07 Get
lostsoul-0.0.3.jar
MC Client, 1.20.1, Forge, Server
Beta 2026-10-02 Get
lostsoul-0.1.1.jar
MC Client, 1.20.1, Forge, Server
Beta 2026-10-02 Get
lostsoul-0.2.1.jar
MC Client, 1.20.1, Forge, Server
Beta 2026-10-02 Get
lostsoul-0.2.2.jar
MC Client, 1.20.1, Forge, Server
Beta 2026-10-02 Get
lostsoul-0.3.1.jar
MC Client, 1.20.1, Forge, Server
Beta 2026-10-02 Get
lostsoul-0.3.2.jar
MC Client, 1.20.1, Forge, Server
Beta 2026-10-02 Get
lostsoul-0.4.1.jar
MC Client, 1.20.1, Forge, Server
Release 2026-10-02 Get
lostsoul-0.3.3.jar
MC Client, 1.20.1, Forge, Server
Beta 2026-10-02 Get
lostsoul-0.0.2.jar
MC Client, 1.20.1, Forge, Server
Alpha 2026-10-02 Get
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