Avatars are an ancient group of magical beings who can bend the very fabric of time. The Avatars tortured Leo Wyatt, with floating heads, to get him to join their collective. Once Leo joins them, the Charmed Ones trust the Avatars strengthening the collective and helping the Avatars to create Utopia. The Charmed ones then realized Utopia was not what they imagined it would be.
Read more about this topic: List Of Magical Beings In Charmed