Poker Face: Kaedweni Camp

This quest starts when you speak to one of the camp's major dice players.

You first have to beat the two dice players in front of the inn. Then you gain the right to play Zyvik. After defeating the sergeant, Madame Carole will then accept playing you. When you have fought all of them (and won), you gain the right to play the blacksmith's assistant.

On defeating the blacksmith's assistant, you can either choose to get your money, or, as proposed, an armor blueprint. Beware, because those blueprints are actually for either leather, hardened leather, or studded leather. These are not armour blueprints, and are not worth it. Keeping the money seems to be a far better choice here.