A supplement for the Brachyr System based on adding an additional skill not included in the core book, as well as a side mechanical system.
The skill in question will be the Siege Weapons skill, covering everything from Ballista, and Catapults to Trebuchets and Cannons. Siege weapons weren't part of the default core book plan, but when someone suggested them I couldn't disagree they'd be a fitting addition. Making them part of a supplement also allows groups to ignore or engage with the mechanics surrounding them as much as they want. The other part of the book will be focused on adding rules for constructing buildings or running businesses such as castles and so forth, with additional advice for dungeon/castle design for map making!
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MS: Something of a cross between an expanded skill book and a Setting book, except I'd be making the tier 1-3 abilities as well rather than just porting them.

PoA: 

1. Skill Explanation

2. Rules

3. Skill Icon

4. Tier 1-9 Abilities

5. Equipment rules

6. Special Items

7. Complications?

8. Magic Effects for Magic skills as relate

9. Running a Castle

10. Castle Design

11. Encounters

12. Example NPCs

13. Narrator Advice

14. Art

15. Expanded CharacterSheet page