[ Sten nods once. That's right. That's Luna's intention simplified. As a small nation, trade is important to them. They need resources to provide for their citizens. ]

I do receive letters! Though you'll have to forgive any delayed answers. Our division is busy, you understand.

[ As for what it is they intend to trade with...

Sten removes a plain silver-colored ring from his pocket. He appears to have brought it with him for the explicit purpose of demonstrating. ]

Cast a small spell upon it. Go ahead.

[ Once Jaskier does so, he'll find the spell or magic he uses is absorbed into the slim band whereupon it gives off a soft glow and the metal turns warm. ]

Magic works wonderfully with it. You see why we believe this might benefit the inventive magic of the Free Cities.