Doppelganger Series by Marie Brennan

When a witch is born, a doppelganger is created. For the witch to master her powers, the twin must be killed. But what happens when the doppelganger survives? Mirage, a bounty hunter, lives by her wits and lethal fighting skills. She always gets her mark. But her new mission will take her into the shadowy world of witches, where her strength may not be a match against powerful magic. Miryo is a witch who has just failed her initiation test... moreWhen a witch is born, a doppelganger is created. For the witch to master her powers, the twin must be killed. But what happens when the doppelganger survives? Mirage, a bounty hunter, lives by her wits and lethal fighting skills. She always gets her mark. But her new mission will take her into the shadowy world of witches, where her strength may not be a match against powerful magic. Miryo is a witch who has just failed her initiation test. She now knows that there is someone in the world who looks like her, who is her: Mirage. To control her powers and become a full witch, Miryo has only one choice: to hunt the hunter and destroy her. less

When a witch is born, a doppelganger is created. For the witch to master her powers, the twin must be killed. Until now...Created by the merging of witch and doppelganger, Mirei is a unique being. Her extraordinary magic makes her the most poweful witch alive—and a notorious social outcast. While Satomi, the leader of the witches’ ruling Primes, hails Mirei as a miracle, rival Primes proclaim that Mirei is an evil abomination... and that those who champion her must be destroyed... moreWhen a witch is born, a doppelganger is created. For the witch to master her powers, the twin must be killed. Until now...Created by the merging of witch and doppelganger, Mirei is a unique being. Her extraordinary magic makes her the most poweful witch alive—and a notorious social outcast. While Satomi, the leader of the witches’ ruling Primes, hails Mirei as a miracle, rival Primes proclaim that Mirei is an evil abomination... and that those who champion her must be destroyed.Now the different witch factions engage in a bloody war with magic, treachery, and murder. But both sides may be fighting for nothing. For the power that the rebel Primes fear, the magic that Mirei alone possesses, is killing her. less

For centuries, the witches of Starfall have served the people of the fourteen domains while keeping their own secrets close. No one outside their ranks knows their power comes from a ritual that divides each newborn daughter in the witch, infused with magic, and the doppelganger, a soulless shell that is soon destroyed.Not all of the doppelgangers are dead, though, and their battle to survive will plunge Starfall into crisis. So long as her doppelganger lives, a witch cannot control her magic... moreFor centuries, the witches of Starfall have served the people of the fourteen domains while keeping their own secrets close. No one outside their ranks knows their power comes from a ritual that divides each newborn daughter in the witch, infused with magic, and the doppelganger, a soulless shell that is soon destroyed.Not all of the doppelgangers are dead, though, and their battle to survive will plunge Starfall into crisis. So long as her doppelganger lives, a witch cannot control her magic. But there are secrets even the witches do not know, and the doppelgangers hold power of their own . . .This omnibus includes the novels from the novel duology Warrior and Witch, as well as the prequel novella Dancing the Warrior. less