Lightless

Summary
The Lightless Sphere biome is stark, nigh-impregnably dark and full of danger if you don't bring ample light.

They contain numerous valuable resources, but are never a bright and cheery place.

Navigation Console

 * These unusual worlds are ancient and something prevents any sun from reaching their surfaces. There may be some useful things there, however. Bring lots of lights!
 * This strange lightless sphere reflects all sunlight. Reason unknown. Effigium Ore detected.
 * The atmosphere of this lightless sphere blocks any sort of light from penetrating. Scans inconclusive.

Layers

 * Space: Elder Asteroids, Asteroids, Corrupt Asteroids
 * Surface: Tentacle, Wart Field, Wasteland, Midnight, Gore Forest, Corrupted Forest, Alien Forest, Sulfuric Magma, Cell Field, Red Desert, Haunted Forest, Haunted Graveyard, Swamp, Blood Gulch, Hell Hive, Elder, Proto, Irradiated
 * Underground: Tentacle, Ruin, Elder, Hell Hive, Crystal Realm, Zen, Colorful, Mushroom, Corrrupted, Spider Nest, Tar, Shadow, Lightless Shadow Sea
 * Core: Core

Wild Crops
The non-agricultural plants in the background alternately yield Bio Sample, Fungal Ichor, Plant Fibre, or Plageus Nodule when broken with the Matter Manipulator.
 * Darklight Flower
 * Shadowroot Spike

Settlements/Dungeons

 * Elder Ruins
 * Crystal Cavern
 * Glitch Sewer
 * Apex Research Lab
 * Apex Test Chamber
 * Apex Tower
 * Floran Prison
 * USCM Bunker
 * Sci-fi Dungeon

Possible Weather
Light Gravity Rain, Gravity Rain, Fog, Insanity Pulses, Rain, Acid Rain.