Caves
Content Expansion 1 is activated on EU #1. It is a guarded content layer over unchanged Worldgen V4, not another biome or generator profile.
See Resources by Biome for the content-layer sources.
EU #1 uses Worldgen V4. Its environments are Plains, Forest, Desert, Swamp, River, Sea, Ocean and Caves. Terrain, water depth and resource placement follow the authoritative server generator.
Water regions: Rivers stay inland and meet the coast. Below sea level, Sea or Ocean takes precedence, including swimming depth and fishing catches. Rivers do not form freshwater corridors across open marine water.
The underground dimension has dark stone floor, rocks and ore nodes, occasional mushrooms, water, lava and blocked void. Paired cave passages retain safe access.
| Property | Active V4 rule |
|---|---|
| Category | Underground |
| Dimension | underground |
| Natural trees | No ordinary naturally generated trees |
Terrain and presentation
Section titled “Terrain and presentation”#4f565bBase colors come from the game renderer. Gentle, stable tile noise adds shade variation without flicker. Plains keeps fewer trees and more open, flowery space; Forest keeps its denser tree cover.
Resources and travel
Section titled “Resources and travel”Use the paired cave entrance and exit. Bring light, food and suitable mining tools. Caves names the underground biome ID; it is not an extra dimension.
Wildlife and threats
Section titled “Wildlife and threats”- Cave Bat
- Cave Skitter
- Murk Eel — actual water tiles only
- Pale Stalker
- Stoneback
Species share the existing local encounter budget. Listed habitats do not guarantee a spawn. Read attack warnings, wolf packs and poison.