Jabe Structure Forge

Build it once. Discover it everywhere.

Jabe Structure Forge is a powerful structure creation and world-generation plugin for PaperMC. Build your own structures, save them, configure their generation rules, and let Minecraft naturally populate your worlds with your creations!

From abandoned ruins hidden deep underground to floating castles, underwater temples, and dangerous dungeons filled with custom mobs, Jabe Structure Forge gives you complete control over what generates in your worlds.

No complicated external editors required. Everything starts directly inside Minecraft.

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🏗️ A Dedicated Creative Building World

Structure Forge provides a dedicated superflat world where server operators can freely build and edit their structures.

Simply run: /sf edit

The editor includes:

• Creative Mode — Unlimited building possibilities.
• Protected Inventory — Your regular inventory is preserved and restored upon leaving.
• Permanent Daytime — No annoying day/night cycles or weather changes.
• No Mob Spawning — Build without interruptions.
• Optimized World Activity — Unnecessary world ticking is reduced.
• Automatic World Management — The editor world loads when needed and unloads when nobody is using it.

When you're finished, use /sf leave to return to your previous location.

🪶 Intuitive Structure Selection

Forget complicated coordinate commands!

Structure Forge provides a special Selection Feather in the first hotbar slot.

• Left-click a block to select the first corner.
• Right-click a block to select the second corner.
• Hold the feather to display a glowing particle wireframe around your selection.

Once you've selected your creation, save it with: /sf create <name>

Already saved a structure and want to improve it? Simply use /sf update <name> to overwrite its contents without losing its generation settings.

Structures are saved using Minecraft's native NBT format, preserving blocks, block states, block entities, and supported entities.

🌍 Advanced Natural World Generation

Every structure has its own customizable generation settings, allowing you to decide exactly where and how it appears.

Available placement modes:

Mode	Description
surface	Generate on natural terrain
underground	Hide structures beneath the surface
floating	Generate structures above the ground
on_water	Build on the surface of water
underwater	Generate submerged structures
on_lava	Generate above lava pools
underlava	Hide structures beneath lava
random_y	Generate at a random permitted height
fixed_y	Generate at a specific height

Structure Forge also supports:

• World and biome whitelists and blacklists.
• Configurable generation frequency and chunk spacing.
• Minimum and maximum generation heights.
• Vertical placement offsets.
• Random 90-degree rotations.
• Structure integrity settings.
• Entity spawning controls.
• Ceiling-aware terrain detection for dimensions such as the Nether.
• Custom worlds and dimensions.

Each structure has its own YAML configuration file, located alongside its NBT file.

Example configuration

enabled: true

worlds:
  - '!world_nether'

biomes:
  - minecraft:plains
  - minecraft:forest
  - '!minecraft:dark_forest'

placement: surface

spacing-chunks: 24
frequency: 0.5

min-y: -64
max-y: 319
y-offset: 0

random-rotation: true
integrity: 1.0
spawn-entities: true

Use ! to exclude specific worlds or biomes. Leaving a filter empty allows all worlds or biomes, respectively.

🧱 Special Structure Placeholder Blocks

Structure Forge introduces special behaviors for two existing Minecraft blocks:

Bedrock — REQUIRED

Bedrock acts as a terrain requirement marker. The destination must contain an existing non-air block at that position.

If the requirement isn't satisfied, Structure Forge can automatically lower the structure, one block at a time, until a suitable position is found.

Barrier — PRESERVE

Barrier acts as a preservation marker. Whatever block exists at that position in the destination world remains untouched, including air, water, and lava.

Neither placeholder is pasted as a physical block during generation.

These markers make it easier to create structures that blend naturally with Minecraft terrain.

⚔️ Spawn Mobs Using Signs

Bring your structures to life with special sign markers!

Vanilla Mobs

Place a sign inside your structure:

MOB
ZOMBIE

When the structure generates, the marker spawns the specified vanilla mob instead of placing the sign.

MythicMobs Integration

With MythicMobs installed, you can also spawn custom mobs:

MYTHICMOB
SkeletalKnight

Simply use the internal MythicMobs ID on the second line.

You can place multiple mob markers throughout a structure to create custom dungeons, encounters, and dangerous landmarks.

🪑 MythicCrucible Furniture Support

Structure Forge also provides optional MythicCrucible integration!

Automatic Furniture Detection

Place MythicCrucible furniture normally inside the editor. Structure Forge can detect supported furniture and save its placement information, allowing MythicCrucible to recreate it when the structure generates.

Furniture Sign Markers

Alternatively, use a sign:

FURNITURE
AncientChair

The second line identifies the MythicCrucible furniture item to place.

Furniture placement supports structure rotation. Automatic detection is best-effort, and specialized per-instance furniture data may not always be preserved.

Both MythicMobs and MythicCrucible are optional dependencies. Structure Forge can run without either plugin.

🧪 Test Before Generating

Not sure why a structure isn't generating?

Use: /sf test <structure>

This command attempts natural placement at your location while bypassing frequency and chunk spacing.

It displays detailed diagnostics, including:

• World and biome compatibility.
• Placement mode and calculated generation height.
• Structure dimensions.
• Bedrock requirement validation.
• Downward placement adjustments.
• Actual values found for each condition.

Each check reports PASS, FAIL, INFO, or SKIP, making it much easier to troubleshoot your configurations.

Successful tests place the actual structure in the world.

📖 Interactive Command Menu

Access the built-in inventory-based help interface using /sf help.

Every available command is represented by an item with a description and usage information. Click to execute supported actions or receive a prefilled command for actions requiring additional arguments.

Main Commands

Command	Description
/sf	Open the help menu
/sf edit	Enter the Creative editor
/sf leave	Leave the editor
/sf pos1	Set the first selection position
/sf pos2	Set the second selection position
/sf create <name>	Save a new structure
/sf update <name>	Overwrite an existing structure
/sf list	List saved structures
/sf info <name>	View structure information
/sf configure <name>	View or modify generation settings
/sf place <name>	Manually place a structure
/sf test <name>	Test natural placement with diagnostics
/sf delete <name>	Delete a saved structure
/sf reload	Reload configurations

The /structureforge and /structures command aliases are also available.

📁 Simple File Management

Your structures are stored in an organized folder:

plugins/JabeStructureForge/
├── config.yml
└── structures/
    ├── ancient_ruins.nbt
    ├── ancient_ruins.yml
    ├── forest_tower.nbt
    ├── forest_tower.yml
    ├── hidden_dungeon.nbt
    └── hidden_dungeon.yml

Each structure has two files:

• NBT — Stores the structure itself.
• YAML — Stores its generation settings and supported furniture metadata.

You can adjust how structures generate without rebuilding them.

⚙️ Compatibility

• Platform: PaperMC
• Minecraft: Designed for Paper 26.3
• Optional integrations: MythicMobs and MythicCrucible
• Permissions: Structure-management commands are intended for server operators.
• Generation: Structures generate in newly generated chunks. Previously generated structures are not retroactively updated.

✨ Build Your Own World

Whether you're creating a survival server, a custom adventure, a fantasy dimension, or a world filled with hidden secrets, Jabe Structure Forge puts structures generation in your hands.

Create. Configure. Generate. Explore.