Star Trek: Deep Space Nine relaunch

The Star Trek: Deep Space Nine (DS9) relaunch is an unofficial name for a series of non-canon novels released since 2000 detailing events involving the characters, species and settings portrayed in the television series Star Trek: Deep Space Nine.

Set after the series finale, "What You Leave Behind", these novels differ from previous Deep Space Nine books in that they form a continuing storyline. Plot points include relations between the Federation and the Dominion following the defeat of the latter in the series finale, the rehabilitation of devastated Cardassia and its relations to Bajor, Bajor's admittance into the Federation, the mirror universe, and the renewed exploration of the Gamma Quadrant. Additionally, in the style of the television series, the books contain a large number of subplots focusing on the development of specific characters.

Following the production of The Soul Key, editor Marco Palmieri left Pocket Books. He was replaced by Margaret Clark, who commissioned the novel The Rough Beasts of Empire (part of the Typhon Pact crossover) set five years into the series' relative future, without covering the intervening years, and leaving the story arc for Iliana Ghemor unresolved, until 2015, when Sacraments of Fire and Ascendance were published.

To offset the departure of characters in the series finale a number of new main and recurring characters are introduced. These include The Next Generation's Ro Laren as chief of security; an Andorian science officer named Thirishar ch'Thane (or Shar for short), through whom the reader is introduced to Andorian culture; the over 100 years old Commander Elias Vaughn, who has a background in intelligence and black ops (as featured in the TNG novel, Battle of Betazed), as the station's new Executive Officer; his daughter Prynn Tenmei as the Defiant's helmswoman; and Taran'atar, a Jem'Hadar observer sent to live on the station by Odo. Colonel (later Captain) Kira Nerys is shown as the station's new commander.

...
Wikipedia