The Dark Powers are just as important as the light, therefore, so are the Dark Power Rituals. They give us a sense of our inner fears and our subconcious. If you are intrested in learning more about the Dark powers, I suggest you read the article Fears and The Dark Powers also take a look at Green Witchcraft II. The Dark powers are not evil, they are merely the side of the Goddess and us that we neglect so often.