Abyssal Decent

ABYSS DESCENT

A Survival-Horror Ocean Descent Mod for Minecraft 1.20.1 (Fabric)

Created by Toby Greenwood

"Thank you for accepting your position with Meridian Deep Recovery."

Overview

Abyss Descent is an immersive, narrative-driven survival-horror mod for Minecraft Fabric 1.20.1. Stepping into the shoes of a deep-sea salvage technician for Meridian Deep Recovery, your simple assignment quickly spirals into a dark, claustrophobic plunge into unexplored ocean depths.

Featuring fully voiced audio briefings, custom dynamic lighting, unique survival mechanics, terrifying fauna, and hand-crafted abyssal biomes, Abyss Descent changes how you view the dark waters below.

Features

Immersive Briefing & Dynamic Descent

• The Meridian Recovery Site: Locate the towering steel gantry and the massive Meridian diving bell in the Overworld.

• Fully Voiced Audio: Experience a cinematic pre-descent briefing with full voice acting, flickering alarms, and subtitle support.

• The Fall: Ride the bell down into the dark. When cable integrity fails, you drop into the pitch-black abyss with no immediate way home.

Deep-Sea Survival Systems

• Helmet Oxygen System: Your helmet tank continuously breathes for you. Refill at air pockets, Oxygen Stations, hydrothermal vents, or with portable canisters. Pay attention to your 25% and 10% warnings!

• Pressure Ratings: The ocean floor will crush you without the right gear. Upgrade from your Mk I helmet to the Pressure Seal Mk II (Layer II) and Hadal Seal Mk III (Layer III) to survive deeper trenching.

• Directional Helmet Lamp (Default: L): Illuminate the dark void directly in front of you.

• Acoustic Sonar: Scan for objectives, track depth and distance, and highlight nearby sea life moving in the pitch dark.

• Underwater Flares: Craftable lighting tools you can throw into the deep to illuminate hazards for 30 seconds.

The Layers of the Abyss

Explore four distinct, deeply atmospheric biomes connected by a winding oceanic chasm known as The Throat:

Story & Boss Progression (Minor Spoilers!)

1. Outpost Tethys: Discover an abandoned underwater habitat. Its AI will inform you that the Ascension Lift home requires three core parts to rebuild.

2. Audio Logs: Recover 6 scattered audio logs to piece together the tragic fate of the previous crew.

3. The Ballast Regulator: Salvage this from the Whalefall Lab inside a colossal skeleton in Layer II.

4. The Lumen Heart: Claim this artifact from the Lantern Shrine in Layer III — but be prepared for what awakens when you touch it.

5. The Abyssal Eye: Dive into the bottom of the Hadal Trench and defeat THE KEEPER — a multi-phase boss utilizing charged strikes, sonic roars, pressure pulses, and minion summons.

6. The Ascension: Bring all three components back to Tethys, initialize the lift, and make your escape.

Creatures of the Deep

• Lanternfish — Gentle bioluminescent fish.

• Gulper Eel — Fast, gaping predators of the upper layers.

• Bone Angler — Lurking hunters hidden within skeletal remains.

• Hollow Diver — What remains of those who came before you.

• Giant Isopod — Armored bottom-feeders.

• Veil Jelly — Drifting, glowing hazards.

• The Mimic — Rule 3: If something calls your name, do not answer.

• THE KEEPER — The ancient leviathan guarding the bottom of the world.

Installation & Dependencies

1. Make sure you are using Minecraft 1.20.1.

2. Install Fabric Loader (v0.14+ recommended).

3. Download and place the following into your .minecraft/mods folder:

   • Abyss Descent (abyss-descent-1.0.0.jar)

   • Fabric API for 1.20.1 (available on Modrinth)

4. Create a new world, find your recovery site, and step inside the bell.

Helper Commands (Cheats Enabled / Op)

• /abyss descend — Skip straight to the descent.

• /abyss goto 0-4 — Teleport to bell, Tethys, Whalefall, Shrine, or Lair.

• /abyss site — Build a Recovery Site next to you.

• /abyss letter / /abyss home / /abyss status — Utility commands.