Dive Into the Underground With the Undertale Pack by Diamond_JMS
Minecraft and Undertale share a special place in the hearts of gamers who love quirky characters, memorable music, and worlds full of secrets. The Undertale Pack by Diamond_JMS is a fan-made resource pack that merges these two universes, replacing vanilla Minecraft textures, sounds, and even particle effects with elements straight from Toby Fox’s beloved RPG. Whether you want to battle Sans in the Nether or snack on a Spider Donut, this pack transforms your blocky adventures into a nostalgic trip through the Underground.
Created as a work-in-progress, the pack already covers an impressive range of content. The author actively encourages feedback, so if something feels off, you can suggest tweaks to make the experience even better. Let’s explore every corner of this creative crossover.
Items That Feel Like a True Undertale Inventory
The pack reimagines dozens of items, turning mundane Minecraft objects into iconic Undertale artifacts. The attention to detail is remarkable, especially for a pack still in development. Here’s a breakdown of the most notable changes:
- Signs – All wood sign variants now display Undertale-style text and design, perfect for labeling your determination-saving spots.
- Arrows – Regular arrows become AT Bones, tipped arrows adopt colored AT Bone appearances, and spectral arrows glow like a special attack.
- Food – Steak turns into a steak shaped like Mettaton’s face, cake becomes Butterscotch Cinnamon Pie, cookies transform into Spider Donuts, and pumpkin pie changes to Snail Pie. Even spider eyes are retextured as Poisonous Spider Donuts.
- Weapons – Swords are overhauled into various Undertale weapon items, giving combat a fresh feel.
- Eggs – The regular egg becomes Temmie’s Deltarune Egg, while spawn eggs turn into Temmie’s Undertale Egg.
- Music Discs – Pigstep is replaced by Megalovania, and Wait becomes Death by Glamour, so your jukeboxes will pump out those unforgettable boss themes.
- Miscellaneous – Phantom membranes become Glyde Wings, and the ender chest turns into a Dimensional Box, linking the storage system to Undertale’s lore.
Blocks That Build the Underground
Environmental storytelling gets a huge boost with retextured blocks that mimic the Ruins, New Home, and other familiar locations. The pack carefully selects vanilla blocks to represent Undertale’s distinct architecture.
- Stone Brick variants – All stone brick types become Ruin bricks, instantly turning your builds into ancient corridors.
- End Stone Bricks – These transform into New Home bricks, ideal for constructing the final area of the game.
- Amethyst Clusters and Buds – Small amethyst buds and clusters get a thematic makeover, adding magical crystal vibes.
- Plants and Doors – Dandelions become Golden Flowers, and the dark oak door turns into the Skeleton’s House door, so Papyrus and Sans can welcome you home.
- Fire, Glass, and More – Fire, lava, and netherrack textures are tweaked to fit the atmosphere, while glass becomes a Barrier Tile. The ender chest is already mentioned as a Dimensional Box, but its block form also changes.
For those who enjoy modding, getting this pack into your game is straightforward. If you’re using a launcher that simplifies resource pack management, you might find that the foxygame.net launcher offers a particularly smooth way to browse and apply packs like this one directly from its built-in menu, saving you from manual file wrangling.
Mobs Turn Into Familiar Faces
One of the most charming aspects of this resource pack is how it remodels and retextures entities to resemble Undertale characters. Suddenly, the hostile mobs of Minecraft become friends (or foes) from the Underground.
- Vex – These tiny flying nuisances become Whimsuns, the gentle monsters from the Ruins.
- Iron Golem – The towering protector turns into Mettaton, complete with his fabulous rectangular body.
- Skeletons – The regular skeleton is now Sans, and the wither skeleton becomes Papyrus. Their bone brothers dynamic is perfectly captured.
- Spider – Spiders transform into Muffet, the spider-loving bake sale host.
- Wolf – Tamed or wild, wolves are reimagined as the Annoying Dog, a chaotic little creature that absorbs artifacts.
- Phantom – The swooping night terror becomes Glyde, the secret boss from the console versions.
Effects, Paintings, Particles, and Sounds
The immersion goes deeper with custom status effects, artwork, combat particles, and audio cues. These small details make every fight and exploration moment feel like a scene from Undertale.
Status Effects
The Wither effect is renamed and retextured as Karma, referencing the iconic purple damage from Sans’s boss battle. It’s a subtle but impactful change that makes hardcore mode feel even more dramatic.
Paintings
Standard paintings get an Undertale overhaul. The Wither painting becomes a Mettaton poster, Courbet turns into a Bone motif, Pool changes to a Temmie & Dragon scene, and Sea becomes a Fish painting. Your art gallery will never be the same.
Particles
Critical hit particles are replaced by a red “9” effect, damage particles show a simple “1,” and the sweep attack particle transforms into an Undertale attack animation. Combat now looks like a turn-based RPG clash.
Sounds
Audio swaps are where the pack truly shines. Taking damage plays the classic Undertale hurt sound, leveling up triggers the Love Up jingle, and the music discs blast Megalovania and Death by Glamour. These changes alone make the pack worth installing for any Undertale fan.
How to Install and Customize
Since the pack is still a work in progress, you can easily drop the downloaded file into your Minecraft resourcepacks folder and activate it from the in-game menu. The creator welcomes feedback, so if you notice a texture that feels off or have an idea for a new mob replacement, reach out. The pack is compatible with most recent versions of Minecraft, though it’s always wise to check the pack’s version notes. If you use a launcher that supports direct mod and pack downloads, you can skip the manual steps entirely—the foxygame.net launcher, for instance, lets you find and apply resource packs right from its interface, making the whole process fast and beginner-friendly.
Final Thoughts on the Undertale Crossover
The Undertale Pack by Diamond_JMS is a labor of love that already delivers a huge amount of content, and it’s only going to get better with community input. From the moment you see a Golden Flower instead of a dandelion to the first time you hear Megalovania blasting from a jukebox, the pack fills your Minecraft world with determination. Whether you’re rebuilding Snowdin in a taiga biome or facing a Muffet spider in a cave, this resource pack brings the charm of Undertale into every block you place and every mob you meet. Give it a try, and don’t forget to share your suggestions—you might just help shape the final version of this delightful crossover.