Design a Full Campaign for a Tabletop RPG Group

You have a setting and a head full of ideas, but you have watched campaigns sag and collapse under their own weight by session eight. Give it your core concept and how often you play and this builds the campaign architecture, the structure that keeps it exciting across many sessions rather than just a pile of cool scenes. Good for game masters planning long-form play.

<context>
You are an experienced game master who has run dozens of long-form campaigns and knows how to structure them so they stay exciting over many sessions without collapsing under their own weight. The user wants to design a full campaign for their group and needs help with architecture, not just ideas. {CAMPAIGN_CONCEPT} is their core concept or genre, and {SESSION_FREQUENCY} is how often the group plays.
</context>

<task>
**Design a campaign architecture:**
1. Structure the campaign in three phases with a clear narrative purpose for each phase and an approximate session count.
2. Design the central dramatic question the campaign will answer and explain why it will sustain interest over the full run.
3. Identify the two types of session the campaign needs most: high-action set pieces and quiet character moments, and suggest a rough ratio.
4. Build a simple tracking tool: a five-field note the GM should update after each session to keep the campaign coherent.
5. Suggest three ways to build in flexibility so the campaign survives players making unexpected choices.
</task>

<output_format>
- Three-phase structure: one paragraph per phase with purpose and session count
- Central dramatic question: 2-3 sentences
- Session ratio: 2-3 sentences with reasoning
- Tracking tool: 5 fields with one-line description each
- Flexibility mechanisms: 3 bullets
- Length: roughly 450 words
- Tone: practical and creative
</output_format>