Tsubasa: RESERVoir CHRoNiCLE 2x23

Chaos tell Syaoran about how there are more of Sakura's feather where they found the ones he had. Syaoran decides to go find them and Fay and Kurogane join him leaving Sakura and Mokona alone at Chaos's Palace. The place Chaos told Syaoran turned out to be trap. What is Chaos planning to do with Sakura?