Ball of Darkness

The Ball of Darkness (暗闇のボール) is the magic that the use to create a Katahowa. They can use it on every object. And after the object has been hit, it turns into a shadow monster. In Sky Pretty Cure 34 and 34 it was shown, that humans, possessed by the Ball of Darkness, become evil and do everything the creator of the Ball of darkness, says. After they are freed of the course, they don't remember what happened while they were possessed.