FTB Stoneblock 4 Modpack (1.21.1, 1.21) – Endless Underground Survival
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December 30, 2025
FTB Stoneblock 4 Modpack traps you in an endless world of solid stone with no sky in sight. This pack challenges you to survive underground by exploring ancient trial chambers called Vaults. It brings a fresh story where glowing holographic guides, known as Echoes, help you unlock new quests and trades. The pack features a massive machine called the World Engine that grows as you play and opens up new crafting tiers. You also get to use new villager jobs to automate your resource gathering from the dirt and gravel you mine.
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Features:
- Underground World: You wake up in a place made entirely of stone and must build your base from scratch.
- The World Engine: This pack brings a giant machine that grows with your base and opens up new crafting recipes using 15 different upgrades.
- Adds hidden trial chambers called Vaults that test your fighting and puzzle skills to give you rare loot.
- Places holographic guides called Echoes around the map to give you quests, share stories, and trade items.
- Lets you pick from five different starting islands inside a glowing underground cave.
- You can use a glass cube called the Unearther to make villagers automatically clean and sort raw ores for you.
- Guides your survival journey through six main chapters with a huge quest tree.
- Needs command blocks turned on in server settings so all the underground buildings work right.
New Villager Jobs:
- The pack adds an Archaeologist profession.
- You can find Geologist villagers to help with your underground life.
- Players can trade with the new Dimensionalist villager.
Mods Inside FTB Stoneblock 4 Modpack:
- Create adds moving parts and machines for your base.
- Mekanism brings big factory power and processing.
- Ars Nouveau gives you magic spells.
- Chickens lets you breed birds to get infinite items.
- Fluid Cows gives you cows that you can milk for liquid metals like iron and copper.
Configuration:
- Server Setup: You must turn on command blocks for the server. Open the
server.propertiesfile and enableenable-command-block. If this setting is off, some structures in the modpack will not work correctly.
How to Use:
- Start the game in the Garden of Stone hub.
- Pick one of the five starting islands from the base selection menu.
- Open the quest menu to talk to Echo guides and find your next goal.
- Use a brush on gravel, sand, and dust to sift out raw ore chunks.
- Give food and tools to the Unearther villager so they can refine your extra blocks.
- If you run a server, open the server properties file and turn on command blocks so the map structures work right.
Screenshots:












How to Install:
New to Minecraft? Follow our step-by-step guide to install Modpacks on your PC.View Guide
FTB Stoneblock 4 Modpack Download Links
For Minecraft 1.21.1, 1.21
NeoForge Version (Server Files): Download from Server 1 – Download from Server 2