Guardians Rising(Book One: The Cursed Kingdom Series)

Sixteen year-old Rylie Fredricks, a rebellious Tom girl with deep scars, wants nothing more than to prove she can do anything. She has always known that she is different from other people, except her best friends Sarah, Derek, and Garreth. They are faster, stronger, and quicker at figuring out situations under pressure than anyone in their village. These things make them targets for the upcoming war against The Dark Knights, a clan of rogue knights that are set on taking the kingdom, finding the four missing treasures that are told to hold great powers and reveal the Guardians of Verdiania.
Then, Rylie and her friends stumble upon a cave hidden within the woods. A chest untouched by the elements resides within, and what it contains will change their lives. Secrets will be pulled to light as Rylie's uncle, Nicholas, reveals that he has known about the treasure and the four's talents, and has been trusted to guard them until they were ready to claim their destinies.
Will they fight a war they were destined for?

[Editing]
(Please don't copy. Thanks!)