Deep Dark

The deep dark is a cave biome that generates deep underground in the Overworld.

Description
The deep dark is an Overworld biome that generates deep underground beneath areas with a low erosion value, such as a mountain peak or a plateau. The biome is dimly lit; there is almost no glow lichen, with the only natural light sources being sculk catalysts and lava, as well as soul fire and lanterns in Ancient Cities.

This biome is often covered in large patches of sculk blocks surrounded by sculk veins, which include sculk-related blocks such as sculk shriekers, sculk sensors and sculk catalysts. No mobs spawn in this biome, but if a player triggers a sculk shrieker a certain amount of times, the warden may appear, giving the player the Darkness effect.

This is the only biome where ancient cities can generate. Other structures that can be found in the deep dark include dungeons, strongholds, and amethyst geodes.

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Trivia

 * The deep dark was originally "going to feel like an underwater biome, but with the water missing." It was originally going "to have lots of floating jellyfish in the air and ghostly looking blocks." In this version, the only source of light would have been bioluminescent blocks.