Mists over Carcassonne: The Spell CirclesExpansion

From BoardGameGeek:

Nebel über Carcassonne: Die Bannkreise ("The Banishing Circles") is a small expansion for Mists over Carcassonne that introduces cats to your ghost-hunting team...although cats can sometimes be less helpful than you might think. As with Mists over Carcassonne, the tiles in Die Bannkreise can be used in a regular competitive game of Carcassonne.