THE UNDYING - Undertale Mod

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THE UNDYING is a mod for Undertale made to celebrate the release anniversary of Deltarune CH3&4 (A.K.A the anniversary of Undyne being kidnapped.)

It aims to improve the fight, adding new attacks, a second phase, unique mechanics such as EN and SKILLS, as well as some more fine-crafted cutscenes to invoke more emotion from the player.

Undertale by Toby Fox

Deltarune by Toby Fox.

Mod by me :3

Development Stage
Devlog
Engine/Language
Game Maker
Published On
May 18, 2026

teen
Cartoon Violence
Mild Fantasy Violence
Mild Language
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Here is just about 2 minutes of gameplay. The new UI is mostly done, with a few things needed here and there.

Phase 2 will most likely be similar to UTY's Genocide Ceroba fight (phase 2) since she basically parallels Undyne in that story.

Read more below

Undertale
Deltarune
6
2

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