Igneous Caverns

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Igneous Cavern

Structures: Underground Inns, Active Laboratories, Abandoned Laboratory, Trial Chambers, Mythic Libraries, and Mineshafts.
Features: Technicolor lava Spouts, Edenite Ore, Amethyst Geodes, and Geothermal Vents.
Blocks: Chromatic deepslate, obsidian, chromatic obsidian, cobbled chromatic deepslate, igenous stone, lava, technicolor lava, water, and bedrock.
Temperature: 3.0 outside of Structures excluding Mineshafts.
Downfall: 1.0
Precipitation: No.

  Igenous Caverns are a cave biome that generates close to the bedrock layer and is among the hottest biomes in the game. They are similar to Earth's lower crust/outer core and the area is nigh-impossible to be traversed without Diamond-Level Armor or Higher with at least Fire Protection III. Mole people, some NPCs, passive Sculkings, Skeletons, Husks, Blazes and Breezes, Fire and Rock Elementals, Worms, and Mice are known to spawn here naturally with the small chance of finding the Replicator within the Abandoned Laboratory. Outside of Mineshafts, all structures that can spawn in the Igenous Caverns are exclusive to it. Igneous Caverns sometimes intersect with Deep Dark caves.
  Underground Inns are areas where Players can buy unique gear and food items, dine at the food court, and have free access to their own bedroom. Active Laboratories are currently inhabited places where Scientist NPCs can be found and interacted with, with the chance of helping the scientists with their complicated machinery, and all kinds of test subjects (notably including Sculkings but also almost any other non-boss monster mob). Trial Chambers are places that can be found near the Active Labs with several floors that contain puzzles, hostile mobs, exlcusive mini-bosses, and plenty of treasure. Abandoned Laboratories are similar to their active counterparts, but much larger and most of the machinery have shut down with some Replicators hiding in some of the capsules.

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Notes:

• Igneous Caverns are inspired by the lower crust and outer core of Earth, but made a bit more colorful.
  
• These caves would be introduced in 2017, or the 1.18 Expedition (this timeline's 1.18).
• Would have been the most dangerous biome in the Overworld if it weren't for the existence of its Neighbor.
• Slightly inspired by Hotland from Undertale and various endgame locations in video games that take the appearance of Lethal Lavalands.
• Trial Chambers here are the structures of the same name from the official 1.21 update, but less mini-game like and more like a glorified sidequest involving the Active labs. Diamonds are as rare in the Overworld as they are in on Earth (not to mention I will use modded and no longer update my MC from now on). Think something closer to a mechanical and tower version of the woodland mansion.