Phoebe Halliwell

 "Phoebe Halliwell's fall into darkness was not an act of betrayal, but a tragedy of love and manipulation. Her rise to the throne of Queen of the Underworld was a painful slide, woven from many intricate threads, at the center of which was her blind love for Cole Turner.

The foundation of this fall began the moment the spirit of The Source possessed Cole. Despite knowing the truth, Phoebe clung to a fragile hope that the good ""Cole"" still existed and that her love was strong enough to save him. This undying belief became her fatal weakness, opening the way for the masterful manipulation of The Seer. Under the guise of an ally, the Seer drew a false prophecy of a powerful child, a child who would bring balance to the world if born from an alliance between Good and Evil. She exploited Phoebe's desire for a happy family, while secretly poisoning her soul with dark ""tonic"" doses.

At the same time, her unborn child, a pure demonic entity, began to change Phoebe from the inside. She became more aggressive, more selfish, and possessed demonic powers such as creating fire. This transformation made her feel increasingly isolated. While she struggled with her inner conflicts, Piper and Paige's legitimate but unforgiving suspicions unintentionally pushed her away, making her feel that only the Downworld could truly accept her new self.

Finally, torn between her love for Cole, the promise of a happy future, the influence of her demonic child, and her feelings of alienation, Phoebe made a fateful decision. She ascended to the throne, believing that she could be a ""good Queen"", controlling the darkness from within. It was an illusion born of love and despair, a tragic mistake that she eventually paid a high price to atone for."