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Forge Mods for Minecraft 1.21

Browse 38 free Forge mods for Minecraft 1.21 — popular picks include The Lost Castle [NeoForge/Fabric], Medieval Buildings [End Edition], Medieval Buildings - New Structures!.

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The Lost Castle [NeoForge/Fabric]
1.21.1neoforge

The Lost Castle [NeoForge/Fabric]

A gigantic castle that once was the home of a long forgotten civilization

21Mdownloads
Medieval Buildings [End Edition]
1.21.5neoforge

Medieval Buildings [End Edition]

New incredible medieval-style structures for the End!

18Mdownloads
Medieval Buildings - New Structures!
1.20.2neoforge

Medieval Buildings - New Structures!

Add exciting medieval buildings with hidden enemies and treasures to the world!

17Mdownloads
Castle in the Sky
1.21.1neoforge

Castle in the Sky

This mod adds new structure: Castle in the Sky in your world

8.6Mdownloads
Medieval Buildings [Nether Edition]
1.21.9neoforge

Medieval Buildings [Nether Edition]

New incredible medieval-style structures for the Nether!

7.9Mdownloads
CastleBlocks
1.21.1neoforge

CastleBlocks

Alternative to chunk claiming, build castles instead!

555kdownloads
[Retired] Dungeons and Taverns End Castle Standalone
1.21.5forge

[Retired] Dungeons and Taverns End Castle Standalone

Retired, we decided to retire this project since keeping it up becomes too much of a technical challange for something that is already within main DNT. There be dragons

489kdownloads
Loot Integrations: Medieval Buildings & End & Nether
1.20.1fabric

Loot Integrations: Medieval Buildings & End & Nether

Adds better loot to Medieval Buildings & End structures chests, including modded loot

381kdownloads
Rev's Better Structures
1.19.2forge

Rev's Better Structures

A mod that adds immersive, randomly generated vanilla-style structures like ruins, trees, and castles to enhance exploration in 1.16+.

289kdownloads
Grim Kingdoms: Lost structures & ruins
1.21.8fabric

Grim Kingdoms: Lost structures & ruins

Adds Castles - Unique vanilla mobs/ hidden items

249kdownloads
Grim kingdoms: Vanilla Edition
1.21fabric

Grim kingdoms: Vanilla Edition

Adds Castles : Both mod versions are vanilla, this version simply removes unique vanilla special items

176kdownloads
Epic Dungeons: A Roguelike Minecraft
1.21forge

Epic Dungeons: A Roguelike Minecraft

Awesome uniquely varied epic dungeons, from the buried Crystal Castle to the spider-infested Forgotten Sewers. Your traveller's journey begins!

163kdownloads
Loot Integrations: The Lost Castle
1.21fabric

Loot Integrations: The Lost Castle

Adds better loot to The Lost Castle chests including modded loot

147kdownloads
Castle Tower
1.21.8neoforge

Castle Tower

Adds a new Castle Tower to Forest Biomes

36kdownloads
Middle Age: castles
1.21neoforge

Middle Age: castles

This mod adds new Castles in Middle Age style.

32kdownloads
Castle Shift
1.21.9neoforge

Castle Shift

Castle Shift introduces procedurally generated castles with diverse layouts, modular room variations, and dynamic architectural themes — creating a different structure each time.

17kdownloads
Epic Knights of the Seven Kingdoms
1.21.1neoforge

Epic Knights of the Seven Kingdoms

An addon for Epic Knights which adds various armors, sigils, weapons from Game of Thrones, House of the Dragon and Knight of the Seven Kingdoms and A Song of Ice and Fire Universe by George R. R. Martin in general

12kdownloads
Lost eternity
1.20.1forge

Lost eternity

Lost eternity is a world generation mod that adds unique surface buildings and dangerous underground dungeons with traps, enemies, and great loot.

9.2kdownloads
Ember's Castles And Keeps
1.21.1forge

Ember's Castles And Keeps

Adds big new castles and towers with traps, enemies, loot and even parkour challenges!

7.8kdownloads
Middle Magnum Opus
1.21.1neoforge

Middle Magnum Opus

An exploration and building based modpack with numerous dungeons and mystical artifacts scattered throughout the world.

2.7kdownloads
Odysseum
1.21.1neoforge

Odysseum

A modpack focused on making Minecraft feel as deep and adventurous as possible. This includes tech, dungeon, dimension, city building, and QoL mods.

1.6kdownloads
Castle and Farm
1.20.1forge

Castle and Farm

Farm and bossfight

1.4kdownloads
ChrabPack
1.21.10neoforge

ChrabPack

A pack centered around the colony building mod Minecolonies, with some dungeon, tech, and magic mods to provide some variety.

543downloads
Craft Spawner Mod (1.21.11, 1.20.6) – Adds A Crafting Recipe For The Spawner
1.21.11fabric

Craft Spawner Mod (1.21.11, 1.20.6) – Adds A Crafting Recipe For The Spawner

Spawners are generated in dungeons in your world. They have the ability to spawn a specific mob type indefinitely and therefore are useful for building beginner mob grinders. In the vanilla game, spawner blocks have no crafting recipe. Craft Spawner Mod is here to change that. As the name suggests, this mod adds a crafting […]

TDmon Mod (1.21.1, 1.20.1) – More Custom Pokémon
1.21.1fabric

TDmon Mod (1.21.1, 1.20.1) – More Custom Pokémon

TDmon Mod is an addon for Cobblemon, adding custom Pokémon to the Cobblemon mod. This mod adds 5 new Pokémon to the game. Features: Stunfisk is uncommonly found in the Swamp, while Galarian Stunfisk is in the Taiga forest. All the monkeys can be rarely found in the Jungle. Be sure to check the Castle […]

Valhelsia Structures Mod (1.21.10, 1.20.1) – Abandoned Buildings, Dungeons
1.21.10forge

Valhelsia Structures Mod (1.21.10, 1.20.1) – Abandoned Buildings, Dungeons

Valhelsia Structures Mod focuses on adding new structures to Minecraft's terrain generation, ranging from abandoned buildings to dungeons. Regarding abandoned buildings, we can find various types of houses, castles, and towers, among others. Exploring their ruins or interiors, both in the case of dungeons and abandoned buildings, will allow us to find some rewards. At […]

SI: Refined Obsidian Mod (1.21.1, 1.20.1) – Build a Blast-Proof Castle
1.21.1forge

SI: Refined Obsidian Mod (1.21.1, 1.20.1) – Build a Blast-Proof Castle

SI: Refined Obsidian Mod adds a full set of building blocks made from obsidian, making it work like a complete stone type. This mod introduces cobbled, polished, brick, and tiled variants for building. It also adds a new armor trim material called obsidian dust to customize your gear's look. Features: Turns obsidian into a full […]

DnT End Castle Standalone Mod (1.21.8, 1.21.1) – Giant End Castle
1.21.8forge

DnT End Castle Standalone Mod (1.21.8, 1.21.1) – Giant End Castle

DnT End Castle Standalone Mod is a Minecraft mod that adds a massive, fortress-like structure to the End dimension-without replacing any vanilla structures. Features: End Castle Structure: Generates a giant End City-style castle with an End Portal Frame. Includes custom trial spawners, loot-filled vases, and End Ships. Can be located using Eyes of Ender, similar […]

DnT Woodland Mansion Replacement Mod (1.21.8, 1.21.1) – Discover The New Illager Manor
1.21.8forge

DnT Woodland Mansion Replacement Mod (1.21.8, 1.21.1) – Discover The New Illager Manor

DnT Woodland Mansion Replacement Mod completely overhauls the standard Woodland Mansion in Minecraft, replacing it with the Illager Manor from Dungeons and Taverns. Features: Replacement of Woodland Mansions: The mod replaces the Woodland Mansions with the Illager Manor, which is much larger and more intricate. New Mansion Layout: Features small, medium, and large rooms, along […]

Dramatic Doors Mod (1.21.1, 1.20.1) – Tall 3×1 Doors
1.21.1forge

Dramatic Doors Mod (1.21.1, 1.20.1) – Tall 3×1 Doors

Dramatic Doors Mod adds tall doors to Minecraft, standing three blocks high instead of the usual two. They’re perfect for decoration-because what kind of castle has ordinary doors? Now, players can create grander and more majestic buildings. All standard door types can now be crafted in their taller versions, making this a feature that was […]

Dungeons and Taverns Desert Temple Replacement Mod (1.21.8, 1.21.1)
1.21.8forge

Dungeons and Taverns Desert Temple Replacement Mod (1.21.8, 1.21.1)

Dungeons and Taverns Desert Temple Replacement Mod changes the look of desert temples in the game. Giant Desert Ruins, filled with sand, suspicious sand, graves, TNT traps, hidden passages, and mobs, replace the usual desert temples. A custom desert village with unique houses and workstations surrounds these ruins. Desert Ruins can be found using villager […]

Tax' Castle Pillager Mod (1.21.1, 1.20.1) – Pillager's Hidden Treasures
1.21.1forge

Tax' Castle Pillager Mod (1.21.1, 1.20.1) – Pillager's Hidden Treasures

Tax's Castle Pillager brings a unique twist to the world of block-building adventures! Crafted by the talented minds of Revvnar and skillfully transformed by Taknax, Tax's Castle Pillager introduces a captivating addition to your Minecraft experience. Within this modification, you'll discover imposing castles inhabited by menacing pillagers, each fortified with hidden underground chambers to explore. […]

Epic Dungeons Mod (1.21.1, 1.20.1) – A Roguelike Minecraft
1.21.1forge

Epic Dungeons Mod (1.21.1, 1.20.1) – A Roguelike Minecraft

Epic Dungeons Mod adds huge, exciting dungeons to your Minecraft world, filled with unique rooms, tough monsters, and amazing loot! Each dungeon is procedurally generated, meaning no two dungeons are identical. You can explore places like the Crystal Castle, Forgotten Sewers, and Molten Asylum, all with different enemies and surprises around every corner. Features: Massive […]

Revamped Piles Mod (1.21.1, 1.20.1) – Enhancing Minecraft, One Block at a Time
1.21.1forge

Revamped Piles Mod (1.21.1, 1.20.1) – Enhancing Minecraft, One Block at a Time

Tired of vanilla Minecraft structures feeling a bit bland? Revamped Piles Mod to the rescue! This mod breathes new life into existing buildings, showering them with intricate details and charming decorations. Imagine blacksmiths with overflowing tool racks, cozy villager huts adorned with hanging baskets, and even revamped dungeons that feel just a touch more perilous. […]

[Retired] DnT End Castle Standalone
1.21.5forge

[Retired] DnT End Castle Standalone

Retired, we decided to retire this project since keeping it up becomes too much of a technical challange for something that is already within main DNT. There be dragons

1.6Mdownloads
Epic Dungeons: A Roguelike Journey
1.21fabric

Epic Dungeons: A Roguelike Journey

Awesome uniquely varied epic dungeons, from the buried Crystal Castle to the spider-infested Forgotten Sewers. Your traveller's journey begins!

776kdownloads