Petrine is one of Daein's Four Riders during the Mad King's War. She is first seen ordering a soldier (or Dakova) out of her camp depending on the player's action. She then continues her pursuit of Elincia. Petrine had wondered why she lost her trust in Ashnard as she was given a tactician. She confronts ike in chapter 7 and has Balmer deal with the Greil Mercenaries. At first she cornered Ike and Greil until some laguz roars could be heard then she orders a retreat. When Kayachey's defense of Tor Garen didn't work, she turned to Homasa to assist Naesala in the battle of the Daein Border. After Naesala deserts the battle, Petrine knew why she hated the raven laguz from the very start and threatens to execute a messenger until he leaves. She heads to Talrega and informs Shiharam of the danger Ike would pose to Daein and orders an immediate flood. After the Black Knight arrives with Lehran's medallion, she orders him to send the medallion to Ashnard when Ena comes back from visiting Nasir. After the Daein Keep is taken, Petrine moves the rest of Daien forces to the Melior castle and presents to her king, Lehran's Medallion. Ashnard had no more trust to Ena so he ordered Petrine to execute her. At Riven Bridge, Petrine sets up traps for Ike and his men for when they try to cross. Ike manages to make it across and kills Petrine who begs for her king's forgiveness. In the Fire Emblem games, Petrine is so far the only female of the Michalis Archetype.