This is a mod pack that expands the concept of cave biomes and makes cave exploration more exciting and spooky. This also contains some horror mods. There will be no list of the horror mods because it must be a surprise. There are also mods that expand your block palette for building.

Fungal Infection: Spore will only be in the first version of this mod pack.

Horror is not exactly the main focus, there are cave mods that contain new biomes and a lot of new blocks and tools.
Cave mod list:
New Cave Biomes! (klsts_cave_biomes)- adds unique biomes for caves, including a pit of rotten flesh. There are new geodes of different colors.
Caverns and Chasms- Adds new cave mobs to fight, new cave features, new blocks, and new tools.
Lucky's Spelunker's Charm II- Adds new cave features, including earthquakes.
Infinite Abyss- adds multiple new dimensions. All of them are cave-related but with different themes.
Infinite Abyss - 1.20.1 (Full Showcase) (youtube.com)
The video is for 1.20.1 but the the features are mostly the same for 1.19.2. It has a lot of content!
The Deep Void- If you go to coordinates 0, -64, 0 you can find a room with an opening to the void. Go in if you dare, but only if you know how to get back.
Philip's Ruins- adds ruins, above and underground.
Obstruction...

Notes:

There is no hunger bar, you eat food and restore health instantly.

There's more tools you can make now with amethyst, emerald, enderite, bedrock, and of course copper.

Some nights, it gets too dark to see without light.

There's plenty of new building blocks, banners, and lights.

This contains Security Craft, so you can craft cameras and protect your home.

New axolotls are added.

You can make aquatic torches with glow ink sacks. They work underwater.

Creeper Overhaul and Enderman Overhaul has been added.

If you see a tall reptilian mob, hold shift and try not to make a sound.

Features in this mod pack are prone to change. The name of the mod pack is inspired/based on Marble Hornets.
Thankyou for your time. Hope you have fun. You can add, remove, and update any mods you want.

All content in this mod pack does not belong to me and all content belongs to their respective owners.

Granite Beetles

Additional Banners

Additional Lights

Amethyst Tools Mod

AppleSkin

Aquatic Torches

Architect's Palette

Architectury API

Arthropod Reborn

Artifacts

AutoRegLib

Axolotl Bucket Fix (Forge)

Balm

Bamboo Everything

Bedrock Miner

Better Copper / Armor and Tools

Better Than Mending

Biome Particle Weather

Blueprint

Bookshelf

Buzzier Bees