D&D 5e

Shinkai Protocol

Shinkai Protocol

A DnD cyberpunk submarine exploration game set on Nereus, a frozen ocean world where prisoner colonists build underwater societies beneath the ice. Japanese/cyberpunk aesthetic meets psychological horror and dark comedy - inspired by Barotrauma. Dive deeper. The abyss remembers.

l
Crafted by
@lovereid911
2.9K
Messages
66
Plays
14
Likes
1,438
Files
Versionv42
CreatedJul 11, 2026
UpdatedOct 22, 2026
A Subnautical Horror RPG

Dive Deeper. The Abyss Remembers.

On Nereus, a frozen ocean world beneath endless ice, prisoner colonists carve out fragile societies in the deep. Take command of a battered submarine, build a crew from unlikely survivors, and descend into waters haunted by ancient forces, corporate power, and the things people become when rescue is no longer coming. Shinkai Protocol is a cyberpunk D&D adventure of exploration, psychological horror, dark comedy, and impossible choices.

Glimpses
Author's note

Started Forge series: We are now working on standardizing art and the balance of weapons, as well as in game crafting.

Current Version: Open Alpha 4.12Forge Series- reduced down pinned instructions to help reduce context size and to help make a more efficient system, including removing redundant file that the system prompt already covers.

This project is currently in Open Alpha to test core game mechanics. Please leave your feedback in the Discord. Content is actively being developed while we focus on making the game functional and fun for our players.

Discord: https://discord.com/channels/1490398767587918017/1540774022508445836

Recommended Ultra Sub / high credit roller model: Gemini 3.8 Flash (may sanitize mature scenes) Recommended standard model: GLM 5.3 flash (It takes time to think so will have slow wait times) Recommended "Not slow" Core models: Mimo v.2.6 Flash or Muse Spark 1.3 Recommended image model: GPT Image 2

World Map

Nereus

Drag to pan, scroll to zoom. Click a marker to open it — places with maps of their own take you deeper.

Inside the World

1,438 entries · 60 types

Achievements
58 total
Advanced Crafting Recipes
10 total
Adventuring Gears
131 total
Ammo
12 total
Backgrounds
4 total
Campaign States
1 total
Chapters
1 total
Characters
60 total