Once & Future Series by Amy Rose Capetta, Cory McCarthy, A.R. Capetta, Cori McCarthy

A modern take on the classic Arthurian legend Ari Helix has been an illegal immigrant in the galaxies for as long as she can remember. But when her spaceship crashes on Old Earth and she pulls a magic sword from an ancient willow, her destiny becomes set in stone. As the forty-second reincarnation of King Arthur she must save humanity from tearing itself apart, with only the help of an adolescent wizard named Merlin... moreA modern take on the classic Arthurian legend Ari Helix has been an illegal immigrant in the galaxies for as long as she can remember. But when her spaceship crashes on Old Earth and she pulls a magic sword from an ancient willow, her destiny becomes set in stone. As the forty-second reincarnation of King Arthur she must save humanity from tearing itself apart, with only the help of an adolescent wizard named Merlin. This female king must battle for her right to be herself, take down totalitarian governments and unite the world. How hard could that be? less

In this epic sequel to Once & Future, Ari and her Rainbow knights must pull off a Holy Grail heist thousands of years in the past -- without destroying their own destinies.Ari Helix may have won her battle against the tyrannical Mercer corporation, but the larger war has just begun. Ari and her cursed wizard Merlin must travel back in time to the unenlightened Middle Ages and steal the King Arthur's Grail -- the very definition of impossible... moreIn this epic sequel to Once & Future, Ari and her Rainbow knights must pull off a Holy Grail heist thousands of years in the past -- without destroying their own destinies.Ari Helix may have won her battle against the tyrannical Mercer corporation, but the larger war has just begun. Ari and her cursed wizard Merlin must travel back in time to the unenlightened Middle Ages and steal the King Arthur's Grail -- the very definition of impossible. It's imperative that the time travelers not skew the timeline and alter the course of history. Coming face to face with the original Arthurian legend could produce a ripple effect that changes everything. Somehow Merlin forgot that the past can be even more dangerous than the future.... less