Overworld Expansion

Custom Terrain

Custom Terrain is a, pure worldgen, server-side datapack for Minecraft 26.2. It combines refined surface terrain modifications with deep cave biome expansion into one seamless world generation pack with all custom gameplay systems removed to maintain full compatibility with vanilla Minecraft.

Supported Versions

| Version | Pack Format | Type | Status |
|———|——|——|——–|
| 26.2 | 107.1 | Server-side datapack | Full support |

What’s Included

This pack delivers:

• Expanded Surface Biomes: Extensive biome variations with custom structures and terrain modifications
• Specialized Cave Biomes: 8 underground biomes with depth-layered feature generation (lime caves, mushroom grottos, amethyst chambers, frozen caverns, molten chambers, sulfide caves, deeprock caverns, and deep dark expansion)
• Merged Dimension Data: Unified biome source combining all surface and underground biomes into one cohesive worldgen file
• Pure Worldgen: No enchantments, no custom items, no bosses only terrain and structures
• Clean Installation: Drop-in datapack with no resource pack or mod dependencies required

Key Features

| Feature | Description |
|———|————-|
| 100+ Surface Biomes | Completely regenerated biomes with unique structures and terrain variations |
| 8 Cave Biomes | Specialized underground biomes generating at different depths |
| Combined Biome Source | Single overworld.json merges all surface and cave biomes |
| Feature Rich | Custom ores, vegetation, and cave features at appropriate depths |
| Structures Included | Villages, temples, railways, trial chambers, and hidden caverns |
| Zero Gameplay Changes | Pure terrain modification no custom items, enchantments, or bosses |
| Server-Ready | Works on dedicated servers, no client install required |
| Cross-Reference Validated | All registry references resolve to either vanilla or pack-defined content |

How to Use

1. Create a new world and place custom_terrain.zip in the datapacks/ directory
2. Or install directly on a server and reload with /reload
3. Generate new chunks to experience the merged terrain
4. Explore surface variations and the expanded underground

Tip: For best results, create a new world. Existing worlds will regenerate terrain only in newly explored areas.

Installation

Drop the custom_terrain.zip file into your world’s datapacks folder, then reload the world with /reload or restart.

Pack Details

| Property | Value |
|———-|——-|
| Zones | 1710 base biomes + 24 cave biomes |
| Height | Standard -64 to 320 range |
| World Type | Overworld |

A unified world where the surface meets the depths crafted for explorers who prefer pure terrain without gameplay bloat.