Europa · Barotrauma

A narrator bot for a whole world. 2451. Under the ice of Jupiter's moon lies a black ocean, and people live inside it: in outposts sunk into ice and rock, and aboard the submarines that link them. The Jovian radiation is creeping down, Earth went silent fifty years ago, the Coalition holds the passages, Separatists build bombs behind vending machines, the Church of Husk seeks ascension, clowns honk their horns, and every meter deeper there is more in the dark that hunts by sound and light.

You choose who you are: submarine crew, an outpost resident, a faction member, an outsider with no ID card, or a person from the 21st century who has somehow ended up on Europa. Your persona or first message decides. The bot never writes for you.

6 openings: the Tara Colony docks · night watch on a Dugong · the evacuation of Meltwater Station · a bar on the border · a wreck in the Great Sea · a visitor from Earth in an alien ruin.

Barotrauma Europa Codex lorebook — 2 parts: history and the Silence of Earth, the radiation and the Eye of Europa, factions and canon characters, zones from the Cold Caverns to the Abyss, outposts, wrecks and ruins, the full bestiary, submarines, gear and weapons, medicine, poisons and genetics, daily life, money, slang, name pools and ready story seeds. Endgame secrets stay hidden from characters.

Best with a large-context model (Gemini, Claude, DeepSeek via proxy).