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, and never generates underneath oceans, rivers or swamps. The biome is dimly lit; there is almost no glow lichen, with the only natural light sources being sculk catalysts and lava.

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 (however monster rooms can still spawn mobs), 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 monster rooms, strongholds, and amethyst geodes.

Music
This music track plays while the player is in the Deep Dark.

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Trivia

 * The deep dark was originally "going to feel like an underwater biome, but with the water missing" along with "lots of floating jellyfish in the air and ghostly looking blocks." White, orange, teal, and lime green were some of the color themes meant for the deep dark. In these versions, the only source of light would have been bioluminescent blocks.
 * If a Buffet world is generated using the Deep Dark as the biome, it will appear similar to a Plains world, but with sculk patches all over the place, even on the surface. Sculk Shriekers can spawn anywhere, making the Warden a near omnipresent threat, but no other mobs will spawn without spawners.