She broke the star sapphire.
Arya used her magic to create a bright light that momentarily blinded Durza and distracted him, giving Eragon the opportunity to stab him with his sword Zar'roc. This allowed them to defeat the Shade and bring an end to his evil influence.
Durza and Arya are in the Eragon/Eldest/Brisingr trilogy be Chris Paolini, they have nothing to do with Chris Wooding.
Arya is an elf. She is the heir to the elvish throne and carried Saphira's egg. She was captured by Durza (a shade) and Eragon is maddly in love with her.
In the prologue, Arya is captured by the shade Durza. In the following chapter Eragon finds a mysterious stone when out hunting and takes it home to the farm where he lives with his uncle and cousin.
The dwarves were angry with Arya in the book 'Eldest' by Christopher Paolini due to her actions in the final battle of the first book 'Eragon' in the inheritance cycle. In order to aid Eragon in his battle against Durza Arya had to destroy a rather valuable jewel of the Dwarves, the Isidar Mithrim. This creation came from years of effort from all the Dwarves, therefore though it saved the life of Eragon and aided the defeat of Durza it resulted in a terrible loss on the Dwarves behalf. Also, Arya always starts a huge argument with the dwarf priest because she does not believe in gods.
In the movie "Eragon," Arya is kept prisoner in Durza's fortress, where she is held captive by the antagonists as they try to extract information from her about Saphira's whereabouts. The fortress is a dark and foreboding place where she is kept under constant guard and surveillance.
In the world of Eragon, Durza is not the only shade in existence. Shades are sorcerers who have allowed dark magic to corrupt them, turning them into powerful and malevolent beings. While Durza is a significant shade in the story, there are others mentioned throughout the series.
In the Inheritance Cycle series, Arya and Eragon share a deep bond and friendship, but there are no clear indications that Arya is in love with Eragon. Their relationship is complex and goes beyond romantic feelings.
In the movie Eragon, Sierra Guillionary acts as Arya.
Eragon defeated the Shade by finding and piercing its true name using the ancient language, which weakened its power and control over the shadows. He then used a powerful spell to banish the Shade to the void, where it was destroyed.
The Twin are identical magician that examines theminds of all that enter the Varden. They are also traitors to the Varden. They betrayed Arya's location to Durza, kidnapped Murtaugh and many other acts.
That has yet to be decided, although most fans would enjoy Eragon and Arya falling in love, or more specifically, Arya falling in love with Eragon
Brom, Eragon, Saphira, Arya and the Ra'zac are a few of them.