FTB Stoneblock 4 Modpack (1.21.1, 1.21) is the latest entry in the iconic StoneBlock modpack series. It delivers a deep underground survival experience with handcrafted Vaults, narrative‑driven Echoes, villager‑powered automation, and the massive World Engine multiblock system.

Features:

  • Handcrafted chambers with puzzles, combat, and endurance challenges. Rewards include rare loot and progression materials.
  • Holographic NPCs (Guidance, Machinist, Quartermaster) that unlock quests, lore, and trades.
  • Central progression artifact with 15+ multiblock upgrades, unlocking new crafting tiers and technologies.
  • Starting hub with five unique islands and branching questlines across six Foundation Chapters.
  • Villagers refine debris into resources; professions include Archaeologist, Geologist, and Dimensionalist.

Screenshots:

Requires:

NeoForge Installer

OptiFine HD

How to install:

Please visit the following link for full instructions: How To Download & Install Modpack

FTB Stoneblock 4 Modpack (1.21.1, 1.21) Download Links

For Minecraft 1.21.1, 1.21

NeoForge Version (Server Files): Download from Server 1 – Download from Server 2

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