Their leader is Chillith, Queen of Freezing Death
Chillith is the leader of the Shadow Sisters
She has ice and snow based powers and can fly through the sky trailing a great blizzard behind her, freezing everything she encounters. Hordak originally sent her to take Frosta's kingdom, but she is more interested in freezing the walls of Castle Grayskull so they can be shattered.
She is cold and aloof, caring nothing for human life. Her Ice-Queen beauty is matched only by her appetite for power and destruction!