The Seer's Prenatal Tonic

After Cole Turner was crowned as the Source of All Evil, he ordered the Seer to give his Queen, Phoebe Halliwell, a prenatal tonic in order to strengthen their growing baby. The tonic had another purpose as well--to slowly eat away at Phoebe's good side and turn her completely evil.

The tonic tasted horrible, and Phoebe hated having to drink it. She even went as far as to pour into a potted plant. Just hours later, she came back to discover the plant was completely dead. The Seer then admitted the tonic's real purpose. Later, when Phoebe confronted Cole about the tonic, he admitted ordering the Seer to give it to her. He claimed that he wanted to spare Phoebe the pain of having good and evil natures dueling with each other, something he'd endured for the better part of two years as Belthazor. The tonic, combined with Cole personally killing Greg Conroy, prompted Phoebe to renounce her crown and join her sisters in vanquishing Cole.