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Beta Decay: Psychological HorrorMinecraft modpack for 1.21.1

A Beta Minecraft style psychological horror modpack for Minecraft 1.21.1 that slowly corrupts your world.

client and servernewest supported release 1.21.1AdventureChallengingCombatMultiplayer
Latest version
4.4.3
Minecraft
1.21.1
Java
Java 21+
Loader
NeoForge
Licence
LicenseRef-All-Rights-Reserved
Downloads
2.0k
Updated
29 d ago
Available on
Modrinth
Space NodeOur hosting

Host Beta Decay: Psychological Horror servers

One click and Beta Decay: Psychological Horror is installed with the right loader, on hardware built for it.

  • 1.21.1
  • NeoForge
  • One click modpack install
  • Dependencies handled
  • Tuned startup flags
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Beta Decay: Psychological Horror declares support for, newest first, with the Java runtime that version needs.

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge21+declared8 Aug 2024

Download

From Beta Decay: Psychological Horror’s own host. Nothing is re-hosted here.

Browse 27 indexed releases

Most recently published release

4.4.3release10 Oct 2026

Beta Decay - Psychological Horror 4.4.3.mrpack · 16.8 MB · for 1.21.1 · NeoForge

Download this release
6da2b0e2503b…
Older versions24
  • 4.4.22 Sept 20261.21.116.8 MB39ce6f02efd2…Get
  • 4.4.116 Aug 20261.21.116.8 MB592876735f91…Get
  • 4.4.025 Jul 20261.21.116.8 MB19 downloadscc397084b27c…Get
  • 4.3.15 Jun 20261.21.116.8 MB178 downloadsc9bb952ce207…Get
  • 4.3.024 May 20261.21.116.8 MB43 downloads9018c39fc9d7…Get
  • 4.2.016 May 20261.21.116.8 MB20 downloads625206cb5844…Get
  • 4.1.016 May 20261.21.116.8 MB11 downloadse182d74b57ba…Get
  • 4.0.110 May 20261.21.116.8 MB18 downloadsf3d815010656…Get
  • 3.4.027 Mar 20261.21.116.8 MB61 downloads340f13b46314…Get
  • 3.3.014 Mar 20261.21.116.8 MB40 downloads759ee83506a2…Get
  • 3.2.08 Feb 20261.21.116.8 MB51 downloadse944b031334d…Get
  • 3.1.115 Jan 20261.21.117.9 MB30 downloads610b3cae2786…Get
  • 3.1.014 Jan 20261.21.117.9 MB22 downloadsbd58af2ae76e…Get
  • 3.0.11 Jan 20261.21.120.6 MB32 downloadsf35256352631…Get
  • 3.0.023 Dec 20251.21.119.9 MB42 downloads944e23ff2ce5…Get
  • 2.2.523 Nov 20251.21.119.4 MB63 downloads5152096a3ee3…Get
  • 2.2.413 Nov 20251.21.120.4 MB37 downloadsa39deb8c1ff6…Get
  • 2.2.38 Nov 20251.21.119.2 MB31 downloads171a00b5fd52…Get
  • 2.2.18 Nov 20251.21.119.2 MB25 downloads576d2c9f0741…Get
  • 2.2.01 Nov 20251.21.119.1 MB40 downloads098a86d1116b…Get
  • 2.1.031 Oct 20251.21.119.1 MB34 downloadse4105000f7fe…Get
  • 2.0.01 Oct 20251.21.118.0 MB66 downloads95c5006c4fb1…Get
  • 1.2.07 Aug 20251.21.110.8 MB165 downloads78f6441b4e09…Get
  • 1.1.61 Aug 20251.21.110.7 MB47 downloads090cb902292e…Get

Frequently asked

Does Beta Decay: Psychological Horror work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Beta Decay: Psychological Horror declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Do I need to install Beta Decay: Psychological Horror on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Beta Decay: Psychological Horror support?

NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Beta Decay: Psychological Horror?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is Beta Decay: Psychological Horror under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Beta Decay: Psychological Horror?

Use a launcher that imports packs, such as Prism Launcher, the Modrinth App or the CurseForge app, and open the pack file with it. The launcher installs the right loader and mods for you; installing a pack's mods by hand is the error-prone way.

Where do I download Beta Decay: Psychological Horror safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

Re-ConsoleA continued Legacy Console Edition experience, expanded upon with modern Java Edition content and QoL! (An Official Legacy4J Project)MAX FPS: Optimized🚀 MAX FPS WITHOUT UNNECESSARY MODS! Only 16 optimization mods - NOTHING EXTRA! ✅ ALL MAJOR VERSIONS ⚡ INSTALLS ON ANY LAUNCHER! (Guide below)PacktrixPre-packed Official Modpack containing Patrix Resource Pack for easy install using Fabric/Quilt.Simply Optimized ReloadedAn unofficial port of Simply Optimized built to support every major mod loader and stay current with the newest versions of Minecraft.FPS+ PvP Boost | Ultimate FPS & Combat Client [ Every Version ]Ultra-lightweight FPS boost & PvP modpack for Fabric. Boost FPS on low-end PCs with Sodium optimizations, lower input lag, cleaner visuals, and combat HUD tweaks built for Hypixel Bedwars, Duels, PotPvP & CPVP. Maximize frames and dominate fights.香草精华 Vanilla EssenceFaithful to the origional. Better vanilla experience without any new blocks or mobs

Details from Modrinth, where the author last updated it on 10 Oct 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .