Karst



Karst is one of the antagonists in Golden Sun: The Lost Age. She is the younger sister of Menardi. Karst meets Felix's party during a scene in Madra, where she swears revenge on Isaac and his party for killing her sister.

Background
Little is known about Karst's background before the games, other than she is Menardi's (presumably) younger sister.

In Golden Sun: The Lost Age
The party first encounter's the fearsome Karst in Madra, where she hears Felix's name spoken by the Mayor of Madra. She confronts him about the whereabouts of her sister Menardi, and through her absence learns of her death. She vows vengeance on Isaac for killing her, and stalks off to find him.

The party sees hide nor hair of Karst until Champa, where they meet her, Alex, and Agatio. The antagonists remind the party of their quest and 'flex some muscle' to pressure them to complete their deeds. They leave the party to their own devices, and sail off in their boat with assurances to 'leave Isaac to them'.

Jupiter Lighthouse is where Karst finally catches up to Isaac, as she and Agatio spring a trap a few levels before the Aerie. Having isolated Mia and Garet, she proceeds to let Agatio take Isaac while she duels Ivan. An odd choice, considering her usual fixation with killing Isaac. Felix and co. interfere and prevent the two Proxians from finishing them off, something Karst will never forgive them for. Isaac gives Felix the Mars Star, and Karst and Agatio escort Felix and Piers to the Aerie. After Felix fires the beacon, Karst announces they have no further use of Felix, and Agatio steals the Mars Star. When Piers asks them if they were betraying them, Karst responds they had already betrayed them [by not allowing them to kill Isaac and getting in their way]. What follows is as epic battle that begins with Felix and Piers facing off against Karst and Agatio in a frenzied flurry of combat. Soon after, Jenna grows worried and runs to the Aerie and leaps into the fray with Felix, much to the Proxians' dismay. Shortly after that, Sheba joins as well, and though Karst knows the odds are now against her, she can't back out now. Finally, Karst and Agatio fall, and the battle concludes. However, before Felix or anyone can deal the finishing blow, Alex intercedes. He informs Felix that killing Karst and Agatio would mean death for his parents who are held hostage in Prox. He heals Karst and Agatio so they can stand-

("I hope you aren't expecting a big thank-you for this, Alex!" - Karst)

- but not enough so they can continue to fight. With that, Karst and Agatio leave and head for their homeland, Prox. And the final Lighthouse.

Fan influence
In fanfiction, Karst is sometimes depicted as having a love interest in Agatio, although Felix comes a close second.