Denna was the Mord-Sith who was ordered to capture Richard Cypher and train him. She succeeded, but Richard's love for Kahlan Amnell let him escape the effects of being trained. He and Kahlan escaped the Mord-Sith temple, but not before Richard had killed Denna. However, another Mord-Sith, Constance, revived Denna with the Breath of Life.
Darken Rahl punished her severely for letting the Seeker get away, and then he ordered her to find the pristinely ungifted one, Jennsen Rahl, and have her bring to him the third Box of Orden. Again, Denna succeeded but the Seeker came upon them and Denna took Jennsen's mother captive (who was also, unbeknownst to her, Zedd's daughter and Richard's mother) in exchange for the third box. To make it more pressing for the Seeker after she realized the woman was important to him, she killed her with her agiel and would only give her the breath of life if they brought the third box back to her.
Plan for powerEdit
After his sister Jennsen took the other two boxes from the People's Palace, Richard managed to put them together despite Denna's efforts and gained the Power of Orden. He discovered Denna had lied, that their mother's body would not last long enough to be revived. In a rage, Richard ordered Kahlan to kill Denna, while Jennsen seperated the Boxes when she saw how the magic was corrupting Richard, saving Denna's life. Denna begged Richard to finish her off before Rahl found her, but he only gave her the chance of a head start away from Rahl.
Denna started a plan to train a D'Haran general, have him kill himself, and then kill Richard to have the general's spirit enter his body. The plan worked at first, but Kahlan and Zedd and Cara caught on and managed to restore Richard's spirit to his own body.
Denna captured Zedd and planned on training him to do her wishes, but Kahlan and Cara killed Denna right before Zedd had gotten her to consider to living a better life.