Catrina, with the help of her servant Jonas, created a potion which allowed her to take on the appearance of the Lady Catrina. She later bluffed her way into the palace using the seal of the House of Tregor. She placed a love charm on Uther and he quickly began bending to her every word. When Merlin began to suspect her, she ordered Jonas to trap him before her marriage to Uther, which went on without a hitch.