Darksaber by Kevin J. Anderson
In this follow-up novel to the Jedi Academy Trilogy and Children of the Jedi, Luke Skywalker and his lover Callista set out on a journey of Force discovery, even as an evil Hutt crime lord builds a superweapon inspired by the Death Star. Meanwhile, Admiral Daala consolidates her power over the remnants of the Empire, preparing to strike back at the New Republic and Luke's recently-formed Jedi Academy. Remembered by some fans as one of the worst Star Wars novels, despite being a great financial success.

Buy on Amazon!

This is a post-Return of the Jedi novel from the Legends timeline. Think of it as an alternate universe from The Force Awakens and newer books.