Basalt Deltas
Basalt Deltas — biome.
Generation
Basalt deltas generate in the Nether and are formed from basalt, blackstone, and lava. The terrain is broken into narrow shelves and pockets, so a straight route often needs bridges or temporary platforms. The biome uses the Nether cave carver, which contributes to its open, irregular cavities.
Natural generation
The biome is a volcanic pocket with frequent basalt columns, blackstone patches, lava, and ash-like open gaps. Its feature passes also place basalt and blackstone blobs, lava springs, fire, soul fire, glowstone, Nether fungi, magma ore, gold, quartz, and ancient debris. Nearby Nether biomes can meet at an abrupt edge, making the boundary useful as a navigation landmark.
The first terrain pass adds deltas and small or large basalt columns. Later passes fill the cavities with volcanic deposits and Nether resources rather than a single uniform layer.
The feature order matters for exploration: columns and shelves are built first, then blobs, springs, fire, fungi, and ores are distributed through the remaining cavities. This is why two nearby sections can have very different heights and visibility.
| Temperature | 2 |
|---|---|
| Downfall | 0 |
| Precipitation | No |
| Generation stages | Deltas, small and large basalt columns, blobs, springs, fire, fungi, and ores |
Spawn groups
The biome definition gives magma cubes the largest monster weight, while ghasts and striders use smaller groups. The fixed group sizes describe a spawn attempt, not a guarantee that every visible ledge contains a mob.
| Magma cube | 2–5; weight 100 |
|---|---|
| Ghast | 1–1; weight 40 |
| Strider | 1–2; weight 60 |
Features
Magma cubes spawn here, while dense basalt formations and lava pockets make travel difficult. Keep a solid retreat behind you when crossing a narrow shelf: knockback and a sudden drop are more dangerous here than in an open cavern. Basalt and blackstone also provide a dark volcanic palette, while the irregular terrain can frame bridges, towers, and protected Nether routes. Mine from a stable ledge before opening a new lava pocket.
Ambient sounds
Basalt deltas use their own looping ambience, additions, mood sound, and Nether background music. White ash particles are also part of the biome's ambient visual effect, with a source probability of 0.118093334.
| Loop | ambient.basalt_deltas.loop |
|---|---|
| Additions | ambient.basalt_deltas.additions |
| Mood | ambient.basalt_deltas.mood |
| Music | music.nether.basalt_deltas |
| Particle | white ash; probability 0.118093334 |
| Mood search extent | 8 blocks; vertical offset 2.0 |
| Mood tick delay | 6000 game ticks |
| Music delay | 12000–24000 game ticks |
Climate and environment
The rough ground limits sight lines and creates short vertical steps. A marked bridge, fire resistance, and a spare block stack make repeated trips safer without flattening the entire delta. Magma cubes are common here, while ghasts and striders use their own smaller spawn groups.
| Water color | #3f76e4 |
|---|
Data values
The biome uses the `minecraft:basalt_deltas` identifier and belongs to the Nether volcanic group.
| Identifier | minecraft:basalt_deltas |
|---|---|
| Version | Minecraft 26.2 |
| Local source | Basalt Deltasbasalt_deltas |
| Dimension | Nether |
| Main materials | Basalt and blackstone |
| Hazard | Lava and magma cubes |
| Temperature | 2.0 |
| Downfall | 0.0 |
| Precipitation | None |
| Fog color | #685f70 |
| Carver | minecraft:nether_cave |
| Water color | #3f76e4 |
| Precipitation flag | false |
| Ambient additions chance | 0.0111 |
| White ash probability | 0.118093334 |
Gallery
See also
References
The biome definition records climate colors, particles, sounds, spawn weights, and feature placement. The generator builder registers the same biome in the Nether registry.
| Local source | Basalt Deltasbasalt_deltas |
|---|---|
| Biome definition | data/minecraft/worldgen/biome/basalt_deltas.json |
| Biome builder | net/minecraft/data/worldgen/biome/NetherBiomes.java |
| Biome registration | net/minecraft/data/worldgen/biome/BiomeData.java |
| Nether carver | minecraft:nether_cave |
Navigation
Data and provenance
minecraft:basalt_deltas
Snapshot digest verified.
Facts
| Temperature | 2 |
|---|---|
| Downfall | 0 |
| Precipitation | No |
| Biome effects | {"waterColor":"#3f76e4"} |
dd84c6a043fa3b14a7d8bce4573d30ba169cdbbd30f84e290cc590e41378351dProvenance and publication
- Readiness
- Pending
- Snapshot
- 918feb41c87c05a6f3e94e327fb01a82543180a2376b65610c6f0521456532a5
- Source set
- 918feb41c87c05a6f3e94e327fb01a82543180a2376b65610c6f0521456532a5
- Entity identifier
- minecraft:basalt_deltas
- Digest
- dd84c6a043fa3b14a7d8bce4573d30ba169cdbbd30f84e290cc590e41378351d
- Missing locales
- ru, en