Atmospheric Nether

Old Growth Crimson and Warped Forests

These forests are characterized by dense vegetation and different fungal types that form in such environments, as well as by strings of shroomlights shining from above. Their respective mobs may spawn more frequently here.

Wailing and Old Growth Wailing Forests

These forests were once normal crimson forests. They are like their crimson counterparts, though they also are characterized by soul sand and soul soil permeating through the ground and ceilings. Many crimson fungi lost their lights, and a frequent shrieking can be heard. These biomes tend to be "emptier," for other entities somewhat avoid them. Otherwise, the scent of decay from zombified piglins and zoglins permeate the air (Zoglins have a 35% chance of spawning as a baby in pre-1.21.2, and 20% chance of spawning as a baby in 1.21.2+).

Dispirited and Old Growth Dispirited Forests

The fungi of these forests have also lost their light, and have succumbed to the soul sand and soil. While they are physically like their wailing counterparts, these forests are also clouded by an air of depression and anger. The enderman here do not take kindly to others. These forests scream out, to no avail.

Ancient Forests

Long lost forests of the nether were preserved by volcanic activity ages ago. While you can no longer find living instances of these forests, you can find their snapshots-in-time within the continental regions. Some magma cubes have made a home here, eating brown mushrooms sprouting from the ground.

Blackstone Caves

Blackstone caves formed from ancient magma chambers. They're made almost entirely of blackstone, only interrupted by large strands of glowstone, as well as the occasional glowstone stalagmite and stalactite.

Quartz Crystal Caverns

These caves host plenty of nether quartz ore, and are home to large quartz crystals! They are only found within and near the continents, and frequently form around the lava rivers.

Gilded Caves

These caves host plenty of nether gold ore. Also found only within and near the continents, especially around the lava rivers, they often mix with quartz crystal caverns to form a treasure hunter's paradise.

Mantle

Thick slabs of magma are layered throughout these biomes with large amounts of basalt sprinkled with blackstone, and both magma blocks and lava coat the surfaces of these caves. Magma cubes love these ones. You can also find giant columns of magma blocks here!

Mournful Hollows

Mournful Hollows are almost entirely made of soul sand with trails of soul soil. Good luck getting through them with so many skeletons!

Crimson and Warped Caverns

These caverns host distant branches of their respective forests. They host the same mobs, but different fungi that adapted to the shallow lava lakes. They are often coated with bands of nether wart blocks, with the roofs hosting shroomlights.

Nether Substratum

Only found underneath the mountains surrounding the continents, these caves were colonized by red and brown mushrooms. The ground here has degraded into large seams of gravel, with many columns of gravel still intact. Perfect for emergency mushroom soup!

Stifled Depths

In the deepest parts of the Nether, most life struggles to exist. No mobs call these caves their home.

Carved Rivers

The ordinary carved river. It can take on the material of surrounding biomes, though most often it is surrounded by netherrack.

Stony Carved Rivers

Basaltic tunnels with blackstone stripes characterize this type of carved river.

Crimson and Warped Carved Rivers

These rivers have been colonized by the two fungi, and tend to be alight with shroomlights.

River Styx

You'll find naught but condemned souls in these rivers.

Continental Barriers and Basaltic Abrasions

These biomes exist at the boundaries of continents, and occasionally exist as lone mountain ranges. They are functionally the same, though basaltic abrasions are made almost entirely of basalt, with slabs of blackstone layered throughout.

Soul Sand Floodplains