Two neighborhoods interact through arcane goods and services. One may supply the other's needs, or contain a natural source for something vital or valuable. Or both may contribute ingredients to complete a final thing.

• What kinds of things are exchanged?
• What kind of people work with them?
• How does the city view such people?

Two neighborhoods interact through arcane goods and services. Although one needs what the other has, the exchange is threatened by mistrust, scarcity, or the volatility of the materials and processes themselves.

• What kinds of things are exchanged?
• What kind of people work with them?
• How does the city view such people?