Sign of the Moon was released in hardcover on 5 April 2011 (same as the United States) and paperback on 26 March 2012. Night Whispers was released in hardcover on 19 November 2010 and paperback on 19 December 2011. Fading Echoes was released in hardcover on and paperback on 5 April 2011. The Fourth Apprentice was released in hardcover on 24 November 2009 (same as the United States) and paperback on 13 December 2010.

Release in Canada generally preceded release in the United States by a few days. Paperback editions of each were released on 21 December 2010, 5 April 2011, 27 December 2011, 3 April 2012, 26 December 2012, and 2 April 2013, respectively. The first four books were also released on their respective dates in an audiobook format, read by Kathleen McInerney. In the United States, hardcover and e-book formats for The Fourth Apprentice were published on 24 November 2009, Fading Echoes on 6 April 2010, Night Whispers on 23 November 2010, Sign of the Moon on 5 April 2011, The Forgotten Warrior on 22 November 2011, and The Last Hope on 3 April 2012. Though the Warriors series has appeared on the New York Times Best Seller list, none of the novels in Warriors: Omen of the Stars have won a significant literary award. The arc's themes deal with forbidden love and the effect that being different can have on relationships. Omen of the Stars details the experiences of Jayfeather, Lionblaze, and Dovewing, who, as part of a prophecy, have special powers.

The novels were written by Erin Hunter, a pseudonym that refers to authors Kate Cary, Cherith Baldry, and Tui Sutherland, as well as plot developer and editor Victoria Holmes. It is made up of six novels published by HarperCollins from 2009 to 2012: The Fourth Apprentice, Fading Echoes, Night Whispers, Sign of the Moon, The Forgotten Warrior, and The Last Hope. Warriors: Omen of the Stars is the fourth arc in the Warriors juvenile fantasy novel series about feral cats who live in Clans.

Warrior cats forest of secrets