Pilar, along with Patra and Phoenix, was once a slave to the Slave King, but escaped and swore revenge, making it their goal to free their people. With help from their mentor Savard, the three demons watched over the Charmed Ones for years to study their powers, personalities and their moves in hopes of mimicking their co-operation. Pilar trained to become Piper Halliwell and channel her powers by injecting herself with Piper's blood.