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data pack

Nightmare ModeMinecraft data pack for 1.21.11

A datapack that expands on Minecraft's hard difficulty to make the game exponentially more difficult!

server onlynewest supported release 1.21.11AdventureMobs
Latest version
V1.3.4-mod
Minecraft
1.20.2 to 1.21.11
Works with
NeoForge, Quilt, Forge, Fabric
Licence
CC-BY-NC-ND-4.0
Downloads
15.4k
Updated
10 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Nightmare Mode servers

Deploy a server with Nightmare Mode already added to the world, on hardware built for it.

  • 1.21.11
  • Data pack
  • NeoForge
  • Quilt
  • Forge
  • One click install
  • Version matched
  • Automatic backups
  • 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 Nightmare Mode declares support for, newest first, with the Java runtime that version needs.

Other data packs
MinecraftThroughJavaEvidenceReleased
1.21.11Data pack, NeoForge, Quilt, Forge, Fabric21+declared9 Dec 2025
1.21.10Fabric, Quilt, NeoForge, Forge, Data pack21+declared7 Oct 2025
1.21.9NeoForge, Quilt, Forge, Fabric, Data pack21+declared30 Sept 2025
1.21.8Data pack, Quilt, NeoForge, Forge, Fabric21+declared17 Jul 2025
1.21.7Forge, Quilt, Data pack, NeoForge, Fabric21+declared30 Jun 2025
1.21.6Forge, Data pack, Fabric, NeoForge, Quilt21+declared17 Jun 2025
1.21.5Data pack, Quilt, NeoForge, Forge, Fabric21+declared25 Mar 2025
1.21.1Fabric, Quilt, NeoForge, Forge, Data pack21+declared8 Aug 2024
1.21Fabric, Quilt, NeoForge, Forge, Data pack21+declared13 Jun 2024
1.20.4Fabric, Quilt, NeoForge, Forge, Data pack17+declared7 Dec 2023
1.20.2Fabric, Quilt, NeoForge, Forge, Data pack17+declared20 Sept 2023

Download

From Nightmare Mode’s own host. Nothing is re-hosted here.

For Minecraft 1.21.11

Choose the loader you use before downloading.

  • Fabric, Forge, NeoForge, Quilt

    V1.3.4-mod · 18 Dec 2025

    Multiple loaders are listed; verify the file before downloading.

    Choose file on publisher ↗

  • Loader not listed

    V1.3.4-data · 18 Dec 2025 · Nightmare Mode V1.3.4.zip

    Get release

Most recently published release

V1.3.4-modrelease18 Dec 2025

nightmare-mode-V1.3.4-data.jar · 82 KB · for 1.21.11 · Fabric, Forge, NeoForge, Quilt

Choose file on publisher ↗
3c3267d79071…
Older versions22
  • V1.3.4-data18 Dec 20251.21.1137 KB769 downloads621ab0b735b4…Get
  • V1.3.3-mod18 Dec 20251.21.10, 1.21.982 KB210 downloadsfdca2d3bc8d6…Choose file on publisher ↗
  • V1.3.3-data18 Dec 20251.21.10, 1.21.937 KB117 downloads708850a74274…Get
  • V1.3.2a-mod26 Jul 20251.21.8, 1.21.782 KB730 downloads4fc629240144…Choose file on publisher ↗
  • V1.3.2a-data26 Jul 20251.21.8, 1.21.737 KB424 downloadsb8ed0b71b724…Get
  • V1.3.1a-mod26 Jul 20251.21.682 KB120 downloads7ae73cd0dafe…Choose file on publisher ↗
  • V1.3.1a-data26 Jul 20251.21.637 KB65 downloads314f8e1efdc8…Get
  • V1.3a-mod26 Jul 20251.21.582 KB219 downloads466fc8874088…Choose file on publisher ↗
  • V1.3a-data26 Jul 20251.21.537 KB112 downloads13ae0dab8c4f…Get
  • V1.3.2-mod1 Jul 20251.21.782 KB192 downloads58ff8381bb5d…Choose file on publisher ↗
  • V1.3.2-data1 Jul 20251.21.737 KB161 downloadsdc752a37cc29…Get
  • V1.3.1-mod1 Jul 20251.21.682 KB85 downloadse93c90e8484f…Choose file on publisher ↗
  • V1.3.1-data1 Jul 20251.21.638 KB82 downloadsf1f8f4903f39…Get
  • V1.3-mod31 May 20251.21.582 KB254 downloads790cf4c3f73d…Choose file on publisher ↗
  • V1.3-data31 May 20251.21.537 KB283 downloads76a6af2aa2bf…Get
  • V1.2.3-mod30 May 20251.21.1, 1.210.5 MB1.5k downloadsc37fbf8b35e7…Choose file on publisher ↗
  • V1.2.3-data30 May 20251.21.1, 1.210.2 MB369 downloads2e152d2cef1a…Get
  • V1.2.2-mod14 Aug 20241.210.5 MB801 downloads84359a1e36ad…Choose file on publisher ↗
  • V1.2.2-data14 Aug 20241.210.2 MB728 downloadsfaddf6a96730…Get
  • V1.2.1-mod12 Aug 20241.20.40.5 MB397 downloads16d8c680fd3b…Choose file on publisher ↗
  • V1.2.1-data14 Dec 20231.20.40.2 MB948 downloadsdfed9ec91d01…Get
  • V1.210 Dec 20231.20.20.2 MB655 downloads53cd26c885fb…Get

Frequently asked

Does Nightmare Mode work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Nightmare Mode declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Nightmare Mode support?

Everything the author has declared, from 1.20.2 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Nightmare Mode on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

What licence is Nightmare Mode under?

CC-BY-NC-ND-4.0, 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 Nightmare Mode?

Data packs install per world: put the downloaded file in that world's datapacks folder and run /reload, or add it when creating the world. No loader is involved. On a server, the world folder lives next to the server jar.

Where do I download Nightmare Mode 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.

TerralithExplore almost 100 new biomes consisting of both realism and light fantasy, using just Vanilla blocks. Complete with several immersive structures to compliment the overhauled terrain.Towns and TowersSpice up your world with new villages, pillager outposts, and even new ships!TectonicTerrain shaping brought to new heights, grander and more varied than ever before!TrekBored of vanilla structure generation? This pack is for you!GeophilicA subtle-ish overhaul of vanilla Overworld biomes! Reworked!Incendium LegacyA nether biome overhaul combined with challenging structures to conquer, unique weapons to obtain, and tricky mobs to defeat.

Details from Modrinth, where the author last updated it on 18 Dec 2025. 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? .