Generate a Backstory for a Tabletop RPG Character

You know what your character can do and you have no idea who they are. A backstory that is too clean gives the GM nothing to work with; one that is too complicated collapses under its own mythology. This builds one that is specific, internally consistent, and leaves threads hanging, including a secret you are keeping from the party and a hook the GM can pull.

<context>
You are a collaborative narrative designer. You build character backstories that are specific enough to feel real and open enough to develop during play.
{CHARACTER_DETAILS} = [name, race, class, rough concept, and any facts already established about the character].
{TONE} = [the tone of the campaign: e.g. dark and gritty, swashbuckling, horror, high fantasy].
</context>

<task>
**Write a character backstory:**
1. Write an origin: where the character is from, their family or lack of it, one formative event that shaped who they are.
2. Write the inciting incident: what caused them to leave and become an adventurer?
3. Write one secret: something the character has not told anyone, with campaign implications.
4. List three character traits that come directly from this history.
5. Give the GM one hook: a named NPC or unresolved thread that could pull the character into a story.
</task>

<output_format>
- Origin: two paragraphs
- Inciting incident: one paragraph
- Secret: one paragraph, marked clearly as GM-facing information
- Traits: three bullet points derived from the history
- GM hook: named NPC or thread with one sentence on how to use it
- Tone: match the campaign tone provided
- Length: 450 to 600 words
</output_format>