Immersive Cavegen

About

A mod aiming to improve certain aspects of minecraft worldgen, namely caves, caverns, mineshafts, and other underground features.

Disclaimer: By default, big epic caves and caverns are not that common! Do not be afraid to tweak the config file to make them more frequent!

Disclaimer 2: If something does not work, conflicts with another mod, etc. try disabling B:"Enable World Population Changes" and B:"Separate Flooded Y Level" in the configuration file before trying anything else.

World Generation Features:

Bigger caves, longer cave systems, different types of cave systems.
Bigger caverns, joined cavern systems, caverns can now spawn in any biome, different types of cavern systems.
Underground water lakes and oceans (the latter only spawning under Deep Oceans by default, but configurable). Note: this feature is known to conflict with world generation mods that add a custom world type, namely Realistic Terrain Generator, Highlands, etc. If they are used, you can turn off this feature (config entry B:"Separate Flooded Y Level") in the config and safely enjoy the rest of the mod.
Different types of stalactites, stalagmites, cave plants, huge glowing mushrooms, as well as vines, cobwebs and occasionally skulls appearing underground.
Mineshafts are longer / have more complex systems.
Improved sand generation.
Custom underground mobs (so far only 2), spawn rates configurable.
Every of the mentioned features are configurable through the config file, as well as the cave frequency multipliers, cavern frequency multipliers, big cave spawn chance, cave width multiplier, filled cave Y level, filled cave material, some structure generation toggles, and much more.

Note: If you're going to be making the caves really huge, I can recommend Biome Height Tweaker's configuration options to give them more height to spawn.

Credit where it's due:

Some of this mod's code is taken from the amazing mod The Master Caver's Underground 4/2. Permissions: https://i.imgur.com/WiCwxNZ.png and https://i.imgur.com/pQVSNKe.png

F.A.Q

Q: When port to version x.x.x?

A: If you want to do it, go ahead, just credit me and The Master Caver.

Q: Modpacks?

A: Of course! No need to ask.