# Forge World

> Free, deterministic web tool that validates Stellaris event YAML and renders it into a playable mod. The same YAML always produces the same mod.

Write a bundle (release.yaml plus events/*.yaml) following the contract, then paste or upload it at the validate or render page. Targets Stellaris 4.5.

## Docs

- [YAML contract](https://forgeworld.app/contract.md): the complete format, every effect and its fields, and an example bundle that validates
- [Introduction to Stellaris event modding](https://forgeworld.app/ebook/01-introduction): ebook chapter 1
- [Option design](https://forgeworld.app/ebook/02-option-design): ebook chapter 2
- [Effects reference](https://forgeworld.app/ebook/03-effects-reference): ebook chapter 3
- [Balance principles](https://forgeworld.app/ebook/04-balance-principles): ebook chapter 4

## Tools

- [Validate](https://forgeworld.app/validate): check one event's YAML and get specific errors
- [Render](https://forgeworld.app/render): upload a bundle or paste an event and download the mod zip