Prepare a situation, not a script. Answer what you know, let AI draft the rest, then adjust what does not fit.

All tools

Build your next session

Start from the hook or situation you already have. Answer a few questions, or let AI answer them, and get a one-page run sheet you can read at the table. Then adjust any section until it fits.

Answer each question yourself, or let AI answer it.

0 of 9 answered

  1. A hook, last session's fallout, or where the campaign stands now. AI uses this to answer the other questions.

No Draft Generated

Use the sidebar generator control panel to customize parameters, then trigger the generation engine to forge details.

Session Hub

Generated drafts appear here automatically. Choose which ones to reuse as context or save to Codex.

GM Reference

At the Table

GM utility details appear here after generation.

Build your next session FAQ

Does the builder write my session for me?

No. It prepares a situation you can run: pressure, people, places, information, complications and consequences. It never sets a scene order or a planned ending, and AI only answers the questions you hand to it or adds options you choose.

Will AI change what I have already written?

Not unless you ask. AI answers only the questions you leave empty. Suggestions appear as options beside a section, and nothing changes until you pick one. Redrafting a whole section happens only when you press Redraft, and you can undo it. Anything the AI added is marked so you can edit or remove it.

Can I use it without AI?

Yes. Answer the questions yourself, online or offline, and build. The builder still flags needed facts that have only one way to be found and turns your answers into a one-page run sheet you can keep adjusting.

What happens to what I type?

When you use AI, your hook, your prep, any notes you give the AI and the ideas you turned down are sent to Google's Gemini API to generate suggestions. Codex analytics do not collect their text. If you save the run sheet, it is stored in a local vault on your device. Avoid submitting sensitive information.

Do I need an account?

No account is needed to build or copy a run sheet. Saving it opens Codex Cryptica so you can choose a local campaign vault.