Star Wars The Dark Nest Trilogy

Star Wars The Dark Nest Trilogy is a series of novels set in the Star Wars universe. The series includes the books Dark Nest I: The Joiner King, Dark Nest II: The Unseen Queen, and Dark Nest III: The Swarm War.
Dark Nest I: The Joiner King is set after the events of the New Jedi Order series and follows the Jedi as they investigate a mysterious force threatening the galaxy. They discover a new species called the Killiks, who are capable of joining minds to form a hive mind, and a former Jedi who has become their leader.
In Dark Nest II: The Unseen Queen, the Jedi continue to investigate the Killik threat and must decide whether to ally with them or fight against them. Meanwhile, a new villain emerges who seeks to use the Killiks for their own dark purposes.
Dark Nest III: The Swarm War concludes the trilogy with the Jedi and their allies battling against the Killiks and their powerful new ally. The fate of the galaxy hangs in the balance as the Jedi face their greatest challenge yet.