High Quality Content by WIKIPEDIA articles! Sacrifice is the fifth book in the Legacy of the Force series. The book is written by Karen Traviss and was released on May 29, 2007.The book starts where Exile left off, with Ben returning to Jacen aboard the Sith battle sphere he found on Ziost. It follows Jacen as he manipulates politics, introducing a new law that allows him to rewrite other laws. Using this and Cal Omas' betrayal as leverage, he and Admiral Niathal stage a bloodless coup, arresting Omas and installing themselves as joint Chiefs of State.