Tredana Series by Joyce Ballou Gregorian

Brought to a strange world where strength of mind and spirit are constantly required of her, Sibby finds friends, adventure, and a sense of belonging.

As a young girl, Sibyl had lived in a magic land conjured by a lonely child's imagination, filled with noble princes, fierce desert chieftains, evil sorceresses, and beautiful mythic creatures--a world of wonder and magic. She called the lands of her world by exotic names and fancied it lay just beyond the windowsill of a crumbling New England mansion. As Sibyl grew up, her childhood fantasy gradually became a dim memory, as remote as a dream half-remembered... moreAs a young girl, Sibyl had lived in a magic land conjured by a lonely child's imagination, filled with noble princes, fierce desert chieftains, evil sorceresses, and beautiful mythic creatures--a world of wonder and magic. She called the lands of her world by exotic names and fancied it lay just beyond the windowsill of a crumbling New England mansion. As Sibyl grew up, her childhood fantasy gradually became a dim memory, as remote as a dream half-remembered. Until the Players of Ornat gathered in the moonlit forest of Tredana and called her home again--and Sibyl finally knew that her fantasies had been reality all along. less

In the final volume of the "Tredana Trilogy," Sibyl Arleon is returned to the continent Tredana incognizant of her past life. Assuming the identity of Batur Subi, Sword-bearer of the World Conqueror, Sibyl becomes an unwitting participant in the war between the Tredanans and the invading Anguls. As the armies march to a final confrontation for mastery of Tredana, batur Subi finds herself face-to-face with the annihilation of her Tredanan loved ones--the royal family of Tredana.